Information om | Engelska ordet BASISPHENOID

Exempel på hur man kan använda BASISPHENOID i en mening

• The typical snake skull has a solidly ossified braincase, with the separate frontal bones and the united parietal bones extending downward to the basisphenoid, which is large and extends forward into a rostrum extending to the ethmoidal region.
• Compared to other choristoderes, the lacrimal bone is reduced in size to a small triangle, the postorbital bone does not form part of the orbit (eye socket), there is no contact between the premaxilla and the vomer bones, an internarial bone is present, the choanae are located posteriorly in correlation to the elongation of the vomer, the interpterygoid vacuity is small and completely enclosed by the pterygoid bones and located near the posterior margin of the suborbital fenestra, the shape of the suborbital fenestra is shortened and kidney like, the articulation between the pterygoid and the parasphenoid is fused, the joint between the skull and the lower jaws is anterior to level of the occipital condyles, the neomorphic bone forms most of the border of the posttemporal fenestra, the paroccipital process is strongly deflected downwards, the basal tubera of the basisphenoid are wing-like in shape and expanded backwards and downwards, the mandibular symphysis (connection of the two halves of the lower jaw) is elongated to over half the length of the tooth row, and the splenial bone strongly intervenes in the mandibular symphysis.
• A study done in 1987 linked Plesiadapiformes with adapids and omomyids through nine shared-derived features, six of which are cranial or dental: (1) auditory bulla inflated and formed by the petrosal bone, (2) ectotympanic expanded laterally and fused medially to the wall of the bulla, (3) promontorium centrally positioned in the bulla, and large hypotympanic sinus widely separating promontorium from the basisphenoid, (4) internal carotid entering the bulla posteriolaterally and enclosed in a bony tube, (5) nannopithex fold on the upper molars, and (6) loss of one pair of incisors.
• At the underside of the braincase, the basisphenoid, the basipterygoid processes are longitudinally stretched.
• Preserved skull elements include the frontal, parietal, left ectopterygoid, left jugal, supratemporals, basioccipital and basisphenoid, and quadrates.
• It also has a more limited angle of 90° between the ventral surfaces of the basioccipital and the basisphenoid, and more caudally, to the rear, situated basipterygoid processes.
• During embryonic development, the clivus is formed by the fusion of the basiocciput and basisphenoid or also known as the sphenooccipital synchondrosis.
• And specimen BMNH R2739, consisting of a basisphenoid and parasphenoid, cervical vertebrae, sacrals with the sacral ribs, an anterior caudal, some ventral ribs, both radii, odd paddle-bones, portions of ilia, ischia, and pubes.
• Sphenoid bone: formed by fusion of the foetal basisphenoid and presphenoid bones, at the base of the skull.
• Sharing similarities with other procolophonids, the braincase of Leptopleuron consists of a relatively long basisphenoid that covers the front part of the basioccipital.
• Zfr 91 comprised part of cranium (big cranium, as Hiller and Mannering would point out later) comprising fragment of right pterygoid bone, basisphenoid bone, basioccipital bone, crushed rights squamosal bone and quadrate bone.
• The pterygoids are unique in that they possess grooves on the dorsal surface, and extend within the posterior interpterygoid vacuities and the pterygoid covering of the ventral surface of the basisphenoid.
• Defining characteristics of Slaugenhopia include a notch in the pterygoid bone of the palate called the pterygoid incisure; the wideness of a projection of bone in the palate called the cultriform process, a wide contact between the parasphenoid and basisphenoid bones on the underside of the skull, and uniquely L-shaped postparietal bones at the back of the skull.
• The mesopterygoid fossa, an opening located behind the end of the palate, is broad and its roof is either fully ossified or perforated by small sphenopalatine vacuities where the presphenoid and basisphenoid bones meet.
• 86 times as long as they are wide, slender basipterygoid projections on the basisphenoid, a bone of the lower braincase, an atlas intercentrum that is horseshoe-shaped in cross-section, slender diapophyses, thin spines of the dorsal vertebrae and sacral vertebrae, the possession of a clear keel at the bottom of the sacral vertebrae, and an ilium with on the inner side a distinct ridge along the edge of the hip joint.
• In many reptiles (including birds), it fuses to the endochondral (cartilage-derived) basisphenoid bone of the lower braincase, forming a bone known as the parabasisphenoid.
• The placement of Itilochelys rasstrigin in the family Cheloniidae is supported by the contact of the squamosal and parietal bones, an emarginated v-shaped crest on the underside of the basisphenoid, and features of the nasal bone structure.
• The basisphenoid is mostly on the side of it, along with the laterosphenoid, the parietal, and the otoccipital.
• Both groups can be distinguished by the anatomy of the basisphenoid, which is distinctly narrower before the basipterygoid crest, has shorter vidian canals and anterior orifices on the ventral rather than the dorsal surface.
• In addition, Hublin (1985, 2001) suggests that the skull has "clear synapomorphies" with Homo sapiens (frontals, squama, parietal bossing, vault wall orientation, a defined tuberculum pharyngeum, a sphenoid spine being present, preglenoid plane orientation) and Rightmire (1990) added traits of the basisphenoid, glenoid, and tympanic.

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