Robert A. Metzger born 1956 is an electrical engineer and science fiction author. He was a Nebula Award finalist in the novel category in 2002 for his second novel, Picoverse . Metzger began writing science fiction stories as a child, but it was not until 1987 that he sold his first science fiction short story. He published his first novel, Quad World , in 1991. It was not until 2002 that he published Picoverse he published his third and most recent novel, Cusp novel Cusp , in 2005. Metzger s works are widely considered hard science fiction. Greg Bear called him one of our most ambitious writers of high tech, hard physics science fiction. Metzger holds a B.S., an M.S., and a Ph.D. in electrical engineering from UCLA . He is co founder of the technical journal Compound Semiconductor , and has authored over a hundred professional research papers. He has also written several articles on science for a popular audience for Wired magazine Wired magazine, and has published speculative studies involving climate engineering and space propulsion, co authored with fellow scientist science fiction novelists Gregory Benford and Geoffrey Landis , respectively. Metzger is also active with the Science Fiction and Fantasy Writers of America SFWA . Works Cusp novel Cusp Science Fiction . Published by Ace, 2005. ISBN 0 441 01241 8. Picoverse Science Fiction . Published by Ace, 2002. ISBN 0 441 00899 2. Quad World Science Fiction . Published by New American Library, 1991. ISBN 0 451 45057 4. External links http www.rametzger.com Robert A. Metzger personal website http www.dpsinfo.com awardweb nebulas 00s.html 2002 2002 Nebula Award finalists isfdb name id Robert A. Metzger Persondata Metadata see Wikipedia Persondata . NAME Metzger, Robert ALTERNATIVE NAMES SHORT DESCRIPTION DATE OF BIRTH 1956 PLACE OF BIRTH DATE OF DEATH PLACE OF DEATH DEFAULTSORT Metzger, Robert Category 1956 births Category Living people Category American science fiction writers Category University of California, Lo ... more details
wiktionary banker Banker may refer to Surname Ashok Banker Mark Banker Mark Banker writer Mark Banker Other Bank engine or helper engine, a locomotive that helps other engines up steep hills. The Banker journal , an industry publication The Banker Deal or No Deal UK , the antagonist on the game show Deal or No Deal The Banker The Office , an episode of the sixth season of the television show The Office The Bankers Book , economist writer Martin Mayer 1975 book about the banking industry on the cusp of deregulation. disambig de Banker ... more details
Wiktionary Pinna can refer to pinna anatomy Pinna anatomy , the outer part of the ear also referred to as the auricle Pinna genus Pinna genus , a genus of bivalve molluscs also known as pen shells In botany the pinnae are the divisions of a compound frond , analogous to the leaflets of a compound leaf A part cusp of a crown pinnae People Christophe Pinna , a French martial artist Giovanni Pinna , a paleontologist and describer of the Triassic reptile Drepanosaurus Places Rosh Pinna , a settlement in Israel disambig de Pinna fr Pinna ... more details
Behavior change can refer to any transformation or modification of human behavior . It may also refer to Behavior change public health , a broad range of activities and approaches which focus on the individual, community, and environmental influences on behavior Behavior change, a rapid and involuntary change of behavior associated with a mental disorder See also Behavior modification Behavior management Behavioral cusp disambig Category Behavior ... more details
Expert subject mathematics date March 2011 File Cubic with double point.svg thumb right 300px A crunode at the origin of the curve defined by y sup 2 sup x sup 2 sup x 1 0 In mathematics , a crunode archaic or node is a point where a curve intersects itself so that both branches of the curve have distinct tangent lines at the point of intersection. For a plane curve, defined as the locus of points f x , y 0, where f x , y is a smooth function of variables x and y ranging over the real numbers, a crunode of the curve is a singularity theory singularity of the function f , where both partial derivatives math partial f over partial x math and math partial f over partial y math vanish. Further the Hessian matrix of second derivatives will have both positive and negative eigenvalues . See also Singular point of a curve Acnode Cusp singularity Cusp Tacnode Saddle point Category Curves Category Algebraic curves geometry stub eo Sinsekco kurbo sl Dvojna to ka ... more details
significance. Seventh house The seventh house, of which the cusp is often but not always the Descendant ... , Reston, VA, 1997 , pp. 28 29. ref Tenth house The tenth house, of which the cusp is often but not always ... more details
no footnotes date September 2008 Image Basic cusp.jpg thumb 320px A beach cusp Beach cusps are shoreline ... they can occur with sediment of any size. They nearly always occur in a regular pattern with cusp s of equal ... once an oncoming wave hits the horn of a beach cusp it is split and forced into two directions ... back out to sea where they are met by incoming waves. Therefore, once the cusp is established ... forms the cusps as the areas with high erosion become the embayments of the cusp and the areas with low ... account for the initial formation of the cusp and not their continued growth afterwards because as the cusp ... a well formed cusp. As the wave strikes the beach, it will first come into contact with the cusp ... is that this method of cusp formation would take time and if you were observing their formation ... cusp formation is associated with the presence of standing edge waves standing edge wave theory , results ... studies, published over the last 50 years to test the predictions of the two main cusp forming hypotheses ... link between cusp development and both edge waves and swash sediment feedback, and that it is not possible ... Carolina Duck , North Carolina to determine the timing of cusp formation to within half a day and the distances separating consecutive cusp horns to within half a metre . Supplementary data provided ... during cusp development. These extensive observations conclusively demonstrate that cusps at this location ... as the wave angle approaches normal incidence. A peculiar suggestion of historisis within the cusp spacing time series was observed and may suggest that existing theories of cusp formation need to be reformulated. ref http www7440.nrlssc.navy.mil abstract 2026.htm Beach Cusp Formation and Spacings ... Morphodynamic Impact of Sea Breeze Activity on a Beach with Beach Cusp Morphology http www.agu.org pubs crossref 2003 2002JC001496.shtml AGU Test of self organization in beach cusp formation http adsabs.harvard.edu ... model for beach cusp formation and development coastal geography DEFAULTSORT Beach Cusps Category ... more details
a is sometimes called the tipping point . br style clear both Cusp catastrophe math V x 4 ax 2 bx , math table align right border 0 cellpadding 0 tr td colspan 2 Image cusp catastrophe.svg frame 320px Diagram of cusp catastrophe, showing curves brown, red of x satisfying dV dx 0 for parameters ... the cusp locus of bifurcations blue , for each point a , b in parameter space there is only one extremising value of x . Inside the cusp, there are two different values of x giving local minima of V x for each a , b , separated by a value of x giving a local maximum. td tr tr valign top td Image cusp shape.svg frame 160px Cusp shape in parameter space a , b near the catastrophe point, showing the locus ... nowrap b 0 td tr table The cusp geometry is very common, when one explores what happens to a fold ... solution will suddenly jump to an alternate outcome. But in a cusp geometry the bifurcation ... smaller and smaller, until above nowrap a 0 they disappear altogether the cusp catastrophe , and there is only ... system passes to nowrap a < 0 through the cusp point 0,0 an example of spontaneous symmetry breaking . Away from the cusp point, there is no sudden change in a physical solution being ... solution becomes available. A famous suggestion is that the cusp catastrophe can be used to model ... and external stresses. The model of the structural fracture mechanics is similar to the cusp catastrophe .... Zeitschrift f r Physikalische Chemie Neue Folge 166, 79 91 1990 . Fold bifurcations and the cusp ..., which meet in two lines of cusp bifurcations, which in turn meet at a single swallowtail ... maximum of the potential function disappear. At the cusp bifurcations, two minima and one maximum ... of the surfaces of fold bifurcations, and the two lines of cusp bifurcations where they meet for a 0 ..., the 2 surfaces of cusp bifurcations, and the lines of swallowtail bifurcations all meet up and disappear, leaving a single cusp structure remaining when a 0 Potential functions of two active variables ... more details
Infobox Anatomy Name PAGENAME Latin GraySubject GrayPage Image Mandibular first premolars01 01 06.png Caption Mandibular first premolars of permanent teeth marked in red. There are no premolars in Deciduous teeth primary teeth . Image2 Caption2 Precursor System Artery Vein Nerve Lymph MeshName MeshNumber The mandibular first premolar is the tooth located laterally away from the midline of the face from both the mandibular canine s of the mouth but mesial toward the midline of the face from both mandibular second premolar s. The function of this premolar is similar to that of canines in regard to tearing being the principal action during mastication , commonly known as chewing. Mandibular first premolars have two cusp dentistry cusp s. The one large and sharp is located on the buccal side closest to the cheek of the tooth. Since the lingual cusp located nearer the tongue is small and nonfunctional which refers to a cusp not active in chewing , the mandibular first premolar resembles a small canine. There are no deciduous teeth deciduous baby mandibular premolars. Instead, the teeth that precede the permanent teeth permanent mandibular premolars are the deciduous mandibular molars. Sometimes, premolars are referred to as bicuspids . Even though the terms are synonymous, bicuspid refers to having two functional cusps, and the mandibular first premolar is an example of a premolar with only one functional cusp. Thus, biscupid is technically not as accurate as premolar . In the Universal numbering system dental universal system of notation , the permanent mandibular premolars are designated by a number. The right permanent mandibular first premolar is known as 28 , and the left one is known as 21 . In the Palmer notation , a number is used in conjunction with a symbol designating in which quadrant the tooth is found. For this tooth, the left and right first premolars would have the same number, 4 , but the right one would have the symbol, , over it, while the left one wou ... more details
In number theory , cuspidal representations are certain group representation representations of algebraic groups that occur discretely in math L 2 math spaces. The term cuspidal is derived, at a certain distance, from the cusp form s of classical modular form theory. In the contemporary formulation of automorphic representation s, representations take the place of holomorphic functions these representations may be of adelic algebraic group s. When the group is the general linear group math operatorname GL 2 math , the cuspidal representations are directly related to cusp forms and Maass form s. For the case of cusp forms, each Hecke eigenform newform corresponds to a cuspidal representation. Formulation Let G be a reductive group reductive algebraic group over a number field K and let A denote the adele group adele s of K . Let Z denote the center of a group centre of G and let be a continuous mathematics continuous character mathematics unitary character from Z K Z A sup × sup to C sup × sup . Fix a Haar measure on G A and let L sup 2 sup sub 0 sub G K G A , denote the Hilbert space of measurable function measurable complex valued functions, f , on G A satisfying f g f g for all G K f gz f g z for all z Z A math int Z mathbf A G K backslash G mathbf A f g 2 ,dg infty math math int U K backslash U mathbf A f ug ,du 0 math for all unipotent radical s, U , of all proper parabolic subgroup s of G A . This is called the space of cusp forms with central character on G A . A function occurring in such a space is called a cuspidal function . This space is a unitary representation of the group G A where the group action action of g G A on a cuspidal function f is given by math g cdot f x f xg . math The space of cusp forms with central character decomposes into a direct sum of Hilbert spaces math L 2 0 G K backslash G mathbf A , omega hat bigoplus pi,V pi m pi V pi math where the sum is over irreducible representation irreducible subrepresentation s ... more details
Infobox Painting image file Gentile da Fabriano 070.jpg title Quaratesi Polyptych image size 180px artist Gentile da Fabriano year 1425 type Tempera on panel height width museum National Gallery, London , Uffizi Gallery , Florence, and Pinacoteca Vaticana , Rome The Quaratesi Polyptych is a painting by the Italian late medieval painter Gentile da Fabriano , now divided between several museums. It was painted by the artist for the Quaratesi family s chapel in the church of San Niccol Oltrarno , perhaps not a long time after the Strozzi Altarpiece . Today four of the five original compartments including the painted cusp are known, as well as some parts of the predella which has scenes of the Life of St. Nicholas Madonna with Child and Angels with, in the cups, Angels and a medallion of the Redeemer central compartment , 222.70 x 83 cm, The Royal Collection, Hampton Court, stored at the National Gallery, London St. Mary Magdalene , with cusp left compartment , 200 x 60 cm, Uffizi, Florence St. Nicholas of Bari , with cusp left compartment , 200 x 60 cm, Uffizi, Florence St. John the Baptist , with cusp right compartment , 200 x 60 cm, Uffizi, Florence St. George , with cusp right compartment , 200 x 60 cm, Uffizi, Florence Predella Birth of St. Nicholas , 36.5 x 36.5 cm, Pinacoteca Vaticana, Rome The Gift of St. Nicholas , 36.5 x 36.5 cm, Pinacoteca Vaticana, Rome St. Nicholas Saving a Ship from the Tempest , 36.5 x 36.5 cm, Pinacoteca Vaticana, Rome Birth of St. Nicholas , 39 x 62 cm, Pinacoteca Vaticana, Rome St. Nicholas Saves Three Youths from the Brine , 36.5 x 36.5 cm, Pinacoteca Vaticana, Rome Miracle of the Pilgrims at St. Nicholas Tomb , 36.5 x 36.5 cm, National Gallery of Art , Washington, D.C. Reconstruction div style border collapse collapse border 1px solid padding 10px width 720px text align center align center File White box 60x70.png 53px File White box 60x70.png 53px rowspan 2 File Gentile da Fabr ... more details
The maxillary first premolar is one of two Tooth human teeth located in the upper jaw, laterally away from the midline of the face from both the maxillary canine s of the mouth but mesial toward the midline of the face from both maxillary second premolar s. The function of this premolar is similar to that of canines in regard to tearing being the principal action during mastication , commonly known as chewing. There are two cusp dentistry cusp s on maxillary first premolars, and the buccal closest to the cheek cusp is sharp enough to resemble the prehensile teeth found in carnivorous animals. There are baby maxillary premolars. At the age of ten to eleven the maxillary canine falls out and makes the first premolars loose on surface for it to fall out. Normally it will take three years for an adult premolar part to grow. In the Universal numbering system dental universal system of notation , the permanent maxillary premolars are designated by a number. The right permanent maxillary first premolar is known as 5 , and the left one is known as 12 . In the Palmer notation , a number is used in conjunction with a symbol designating in which quadrant the tooth is found. For this tooth, the left and right first premolars would have the same number, 4 , but the right one would have the symbol, , underneath it, while the left one would have, . The international notation has a different numbering system than the previous two, and the right permanent maxillary first premolar is known as 14 , and the left one is known as 24 . References Ash, Major M. and Stanley J. Nelson, 2003. Wheeler s Dental Anatomy, Physiology, and Occlusion. 8th edition. Teeth toothpicture Image Maxillary first premolars01 01 06.png text Maxillary first premolars of permanent teeth marked in red. There are deciduous and permanent premolars. Category Types of teeth musculoskeletal stub dentistry stub bs Prvi predkutnjak gornja vilica ja pt Primeiro pr molar superior sr fi Ylem ... more details
Other uses Vertex disambiguation Image Ellipse evolute.svg right thumb 240px An ellipse red and its evolute blue . The dots are the vertices of the curve, each corresponding to a cusp on the evolute. In the geometry of curve s, a vertex is a point of where the first derivative of curvature is zero. This is typically a local Maxima and minima maximum or minimum of curvature. Other special cases may occur, for instance when the second derivative is also zero, or when the curvature is constant. For a circle which has constant curvature, every point is a vertex. The four vertex theorem states that every closed curve must have at least four vertices. Vertices are points where the curve has Contact mathematics Contact between curves 4 point contact with the osculating circle at that point. The evolute of a curve will generically have a cusp singularity cusp when the curve has a vertex. Other, more degenerate and non stable singularities occur at higher vertices. Higher vertices generically occur in a one parameter family of curves when two ordinary vertices coalesce to form a higher vertex after which they annihilate. The symmetry set has endpoints at the cusps corresponding to the vertices, and the medial axis , a subset of the symmetry set , also has its endpoints in the cusps. If a curve is reflection symmetry bilaterally symmetric , it will have a vertex at the point or points where the axis of symmetry crosses the curve. Thus, the notion of a vertex for a curve is closely related to that of an vertex optics optical vertex , the point where an optical axis crosses a Lens optics lens surface. Vertices of a conic section A hyperbola has two vertices, one on each branch they are the closest of any two points lying on opposite branches of the hyperbola, and they lie on the principal axis. On a parabola, the sole vertex lies on the axis of symmetry. On an ellipse, two of the four vertices lie on the major axis and two lie on the minor axis. References unreferenced date Nov ... more details
The Kato theorem , or Kato s theorem , is used in computational quantum mechanics quantum physics . ref cite journal last Kato first Tosio title On the eigenfunctions of many particle systems in quantum mechanics journal Communications on Pure and Applied Mathematics year 1957 volume 10 issue 2 pages 151 177 doi 10.1002 cpa.3160100201 ref ref cite journal last March first N. H. title Spatially dependent generalization of Kato s theorem for atomic closed shells in a bare Coulomb field journal Phys. Rev. A year 1986 volume 33 issue 1 pages 88 89 doi 10.1103 PhysRevA.33.88 url http link.aps.org doi 10.1103 PhysRevA.33.88 accessdate 16 June 2011 bibcode 1986PhRvA..33...88M ref It states that for generalized Coulomb potentials, the electron density has a Cusp singularity cusp at the position of the nuclei, where it satisfies math Z k frac a o 2n mathbf r frac dn mathbf r dr r rightarrow mathbf R k math Here math mathbf R k math denotes the positions of the nuclei, math Z k math their atomic number and math a o left frac h 2 pi m e right 2 math is the Bohr radius . For a Coulombic system one can thus, in principle, read off all information necessary for completely specifying the Hamiltonian directly from examining the density distribution. This is also known as Edgar Bright Wilson E. Bright Wilson s argument within the framework of density functional theory DFT . The electron density of the ground state of a molecular system contains Cusp singularity cusps at the location of the nuclei, and by identifying these from the total electron density of the system, the positions are thus established. From Kato s theorem, one also obtains the nuclear charge of the nuclei, and thus the external potential is fully defined. Finally, integrating the electron density over space gives the number of electrons, and the electronic Molecular Hamiltonian Hamiltonian is defined. This is valid in a non relativistic treatment within the Born Oppenheimer approximation , and assuming point like n ... more details
Refimprove date April 2007 In Anatomy , the Curve of Spee called also von Spee s curve or Spee s curvature is defined as the curvature of the mandibular occlusal plane beginning at the tip of the lower cuspid and following the buccal cusp dentistry cusp s of the posterior teeth , continuing to the terminal Molar tooth molar . According to another definition Curve of Spee is an anatomic curvature of the occlusal alignment of teeth, beginning at the tip of the lower canine, following the buccal cusps of the natural premolars and molars, and continuing to the anterior border of the ramus. Ferdinand Graf von Spee, German embryologist, 1855 1937 was first to describe anatomic relations of human teeth in the sagittal plane. The pull of the main muscle of mastication, the masseter , is at a perpendicular angle with the curve of Spee to adapt for favorable loading of force on the teeth. The Curve of Spee is, essentially, a series of slipped contact points. It is of importance to orthodontists as it may contribute to an increased overbite. Larry Andrews, in his important paper Six Keys to Normal Occlusion 1972 , stated that a flat or mild curve of Spee was essential to an ideal occlusion. The curve of Spee should not be confused with the curve of Wilson, which is the upward i.e. U shaped curvature of the maxillary and mandibular occlusal planes in the coronal plane. Category Teeth dentistry stub musculoskeletal stub de Spee Kurve ... more details
Infobox Anatomy Name PAGENAME Latin arcus dentalis mandibularis, arcus dentalis maxillaris GraySubject 242 GrayPage 1114 Image Gray996.png Caption Permanent teeth of upper dental arch, seen from below. Image2 Gray997.png Caption2 Permanent teeth of right half of lower dental arch, seen from above. System Precursor MeshName MeshNumber DorlandsPre a 58 DorlandsSuf 12150553 The superior dental arch is larger than the inferior, so that in the normal condition the teeth in the maxillae slightly overlap those of the Human mandible mandible both in front and at the sides. Since the upper central incisors are wider than the lower, the other teeth in the upper arch are thrown somewhat distally, and the two sets do not quite correspond to each other when the mouth is closed thus the upper canine tooth rests partly on the lower canine and partly on the first premolar , and the cusp dentistry cusp s of the upper molar teeth lie behind the corresponding cusps of the lower molar teeth. The two series, however, end at nearly the same point behind this is mainly because the molars in the upper arch are the smaller. dentistry stub musculoskeletal stub Gray s Category Mouth ... more details
Enamel spindles are short, linear defects, found at the dentinoenamel junction DEJ and extend into the Tooth enamel enamel , often being more prevalent at the cusp dentistry cusp tips. ref name Histology Course Notes 2004, page 2 Histology Course Notes Mature Enamel , New Jersey Dental School, 2003 2004, page 2. ref The DEJ is the Interface chemistry interface of the enamel and the underlying dentin . Because they are formed by entrapment of odontoblast processes between ameloblast s prior to and during amelogenesis , they cannot be found at the enamel surface protruding inward, as enamel lamellae are often located. Enamel spindles are often confused with two other entities enamel lamellae and enamel tufts . Lamellae are linear enamel defects that extend from the surface of the enamel towards the DEJ, or vice versa. Enamel tufts are small, branching defects that are found only at the DEJ, protruding into the enamel towards the enamel surface. Enamel spindles however, are in fact odontoblast processes that extend into the enamel. ref name Histology Course Notes 2004, page 2 ref Oral Biology Course Notes Dentine and Pulp , Otago University School of Dentistry, 2006 2007, pg 109. ref References references Category Dental enamel Category Dental disorders dentistry stub ... more details
as a lower molar tooth molar because it has two longitudinal rows of cusp dentistry cusps as a first .... A low crest connects the first lingual to the first labial cusp and a stronger crest, separated from the first by a relatively shallow valley, connects the second lingual to the first labial cusp. Behind this structure, a second triangle is formed by two crests passing from the second lingual cusp ... cusp is also connected to two crests, which encircle a small depression and presumably connected to one ... is less curved the ridges attached to the second lingual cusp form another triangle the tooth ... more details
italic title Taxobox name Agathia pisina image Agathia pisina.jpg image width image caption image2 Agathia pisina1.jpg image2 width image2 caption status status system regnum Animal ia phylum Arthropod a classis Insect a ordo Lepidoptera familia Geometridae genus Agathia species A. pisina binomial Agathia pisina binomial authority Butler, 1887 ref http www.environment.gov.au biodiversity abrs online resources fauna afd taxa Agathia pisina Australian Faunal Directory ref synonyms Agathia asterias small Meyrick, 1888 small Agathia diversilinea small Warren, 1896 small Agathia ampla small Prout, 1911 small Agathia dimota small Prout, 1911 small Agathia irregularis small Prout, 1916 small Agathia pisina is a species of moth of the Geometridae family. It is found in Australia including Queensland and Norfolk Island . Image Agathia pisina2.jpg thumb left 200px Adults are green with brown markings. The hindwings have a cusp halfway along the margin. There is also a brown cusp white spot at each hindwing tornus. ref http lepidoptera.butterflyhouse.com.au geom pisina.html Australian Insects ref The larvae feed on Gymnanthera oblonga . References Reflist wikispecies commons Category Animals described in 1887 Category Geometrinae Geometrinae stub ... more details
a cusp on the front lingual inner corner, present in both other species Samonds assigned this specimen ... large cusp is present on C1, with a smaller shelf at the back side. P2 is very small and P4 contains a high cusp at the front, a smaller cusp before it on the inner lingual side, and a shelf behind the high cusp. ref name S51 The length of P4 averages 2.13 mm, with a standard deviation SD ... jaw are small and have three cusps. The lower canine c1 has one high and narrow cusp. The second lower premolar p2 is a large tooth with a high central cusp and high crests connecting this cusp to the front and back edges. A second, smaller cusp is present in the back crest. The fourth premolar p4 also has a high central cusp in addition, there are smaller roots before and behind it on the lingual side. This tooth has two roots. ref name S51 In the first lower molar m1 , a large tooth, the cusp ... more details
orphan date July 2009 unreferenced date July 2009 Aspirational age is a concept from advertising and marketing , and refers to an ideal age whose characteristics consumers aspire to embody. Thus, marketing messages aimed at that target age will resonate with consumers of other ages. It is said that the aspirational age in Western society is 16 or 17, the cusp between childhood and adulthood. In theory, consumers younger than this age aspire to the maturity and freedom it signifies, while those older than it seek to recapture the real or imagined youthfulness and freedom from responsibility of this age. Thus, products pitched at notional 16 year olds will appeal to a broader target market . Category Marketing terminology marketing stub nl Aspirationele leeftijd ... more details
x infty text , math then the graph of &fnof will have a vertical cusp that slopes down on the left ... has a vertical cusp at x 0, since it is continuous, math lim x to 0 g x lim x to 0 frac ... more details
Infobox Anatomy Name Aortic opening Latin ostium aortae GraySubject 138 GrayPage 534 Image Caption Image2 Caption2 System Precursor MeshName MeshNumber DorlandsPre o 09 DorlandsSuf 12601868 The aortic opening aortic orifice is a circular aperture, in front and to the right of the atrioventricular , from which it is separated by the anterior cusp of the bicuspid valve . Its orifice is guarded by the aortic semilunar valves . The portion of the ventricle immediately below the aortic orifice is termed the aortic vestibule , and possesses fibrous instead of muscular walls. External links eMedicineDictionary aortic orifice Gray s Heart Category Circulatory system Category Blood vessels circulatory stub ... more details
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