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	Topics Snake skeleton Topic Home Skull The typical Ophidian skullSkull The skull or cranium is a bony structure found in many animals which serves as the general framework for the head.... is characterized by a solidly ossified brain-case, with the distinct frontals and the united parietals extending downwards to the basisphenoid, which is large and produced forward into a rostrum extending to the ethmoidal region. The nasal region is less completely ossified, and the paired nasals are often attached only at their base. The occipital condyleOccipital condyle The lateral parts of the occipital bone are situated at the sides of the foramen magnum; on their under surfaces are the occipi... is either trilobate and formed by the basioccipital and the exoccipitals, or a simple knob formed by the basioccipital; the supraoccipital is excluded from the foramen magnumFacts About Foramen magnum In anatomy, in the occipital bone, the foramen magnum is one of the several oval or circular apertures in the base of the sk... . The basioccipital may bear a strong, curved ventral process or hypapophysis (in the Vipers). The prefrontal bonePrefrontal bone The prefrontal bone is a bone separating the lacrimal and frontal bones in many tetrapod skulls.... is situated, on each side, between the frontal and the maxillary, and may or may not be in contact with the nasal. The postfrontal, usually present, borders the orbit behind, rarely also above, and in the Pythons a supraorbital is intercalated between it and the prefrontal. The premaxillary is single and small, and as a rule connected with the maxillaryMaxillary Maxillary is something related to the maxilla bone.... only by ligamentLigament In anatomy, the term ligament is used to denote three different types of structures:... . The paired vomer is narrow. The palatineFacts About Palatine bone The palatine bone is a bone situated at the back part of the nasal cavity between the maxilla and the pterygoid process of t... and pterygoidFacts About Pterygoid Pterygoid can refer to:* a plate near the Vomer bone... are elongate and parallel to the axis of the skull, the latter diverging behind and extending to the quadrate or to the articular extremity of the mandible; the pterygoid is connected with the maxillary by the ectopterygoid or transverse boneBone Bone, also called osseous tissue, is a type of hard endoskeletal connective tissue found in many vertebrate animals.... , which may be very elongate, and the maxillary often emits a process towards the palatine, the latter bone being usually produced inwards and upwards towards the anterior extremity of the basisphenoid. The quadrate is usually large and elongate, and attached to the cranium through the supratemporal (often regarded as the squamosal). In rare cases (Miodon, Polemon) the transverse bone is forked, and articulates with two branches of the maxilla. The quadrate and the maxillary and palatopterygoid arches are more or less movable to allow for the distension required by the passage of prey, often much exceeding the calibre of the mouth. For the same reason, the rami of the lower jaw, which consist of dentary, splenial, angular, and articular elements, with the addition of a coronoid in the Boidae and a few other small families, are connected at the symphysis by a very extensible elastic ligament. The hyoid apparatus is reduced to a pair of cartilaginous filaments situated below the trachea, and united in front. There are various modifications according to the generaGenus In the binomial nomenclature used worldwide, the name of an organism is composed of two parts: its genus name and a species... . A large vacuity may be present between the frontal boneFrontal bone The frontal bone is a bone in the human skull that resembles a cockle-shell in form, and consists of two portions:... s and the basisphenoid (Psammophis, Coelopeltis); the maxillary may be much abbreviated and movable vertically, as in the Viperidae; the pterygoids may taper and converge posteriorly, without any connexion with the quadrate, as in the Amblycephalidae; the supratemporal may be much reduced, and wedged in between the adjacent bones of the cranium; the quadrate may be short or extremely large; the prefrontals may join in a median suture in front of the frontals; the dentary may be freely movable, and detached from the articular posteriorly. The deviation from the normal type is much greater still when we consider the degraded wormlike members of the families Typhlopidae and Glauconiidae, in which the skull is very compact and the maxillary much reduced. In the former this bone is loosely attached to the lower aspect of the cranium; in the latter it borders the mouth, and is suturally joined to the premaxillary and the prefrontal. In both the transverse bone and the supratemporal are absent, but the coronoid element is present in the mandible. The principal modifications of the skull in the European genera may be contrasted as in the following synopsis: I. Quadrate articulating with the cranium, supratemporal absent; mandible much shorter than the skull, with coronoid bone; maxillary small, on lower aspect of cranium; pterygoids not extending to quadrate; nasals forming long sutures with the premaxillary, prefrontals, and frontal .......... TyphlopsTyphlops *Typhlops* is a genus of worm snakes in family Typhlopidae, Blind snakes.... . II. Quadrate suspended from the supratemporal; mandible at least as long as the skull; pterygoids extending to quadrate or mandible. A. Mandible with coronoid bone; nasals in sutural contact with frontals and prefrontals; transverse bone short, not projecting much beyond cranium; maxillary not half as long as mandible, which is not longer than skull (to occiput) .......... EryxEryx In Greek mythology, Eryx was the son of Aphrodite and King Butes of the Elymian people on Sicily.... . B. No coronoid bone; nasals isolated. 1. Maxillary elongate, not movable vertically. a. Maxillary half as long as mandible. Supratemporal half as long as skull, projecting far beyond cranium; mandible much longer than skull .......... Tropidonotus. Supratemporal not half as long as skull, projecting far beyond cranium; mandible much longer than skull .......... ZamenisZamenis *Zamenis* is a genus of snake in the Colubridae family.... . Supratemporal not half as long as skull, projecting but slightly beyond cranium; mandible much longer than skull .......... ColuberColuber *Coluber* is a genus of thin bodied, fast moving, colubrid snakes commonly known as racers.... . Supratemporal not half as long as skull, not projecting beyond cranium; mandible not longer than skull .......... CoronellaCoronella Overview These are relatively small species, rarely growing to more than 60 cm in length.... , Contia. b. Maxillary not half as long as mandible, which is longer than skull; supratemporal not half as long as skull, projecting beyond cranium. Quadrate longer than supratemporal; maxillary much longer than quadrate, nearly straight in front of prefrontal; a large vacuity between the frontal bones and the basisphenoid .......... Coelopeltis". Quadrate not longer than supratemporal; maxillary little longer than quadrate, strongly curved in front of prefrontal .......... MacroprotodonMacroprotodon *Macroprotodon* is a genus of snake in the Colubridae family.... Quadrate longer than supratemporal; maxillary little longer than quadrate, nearly straight in front of prefrontal .......... Tarbophis 2. Maxillary much abbreviated and erectile; supratemporal not half as long as skull; mandible much longer than skull; basioccipital with a strong process. Maxillary bone solid .......... ViperaVipera Common names: Palaearctic vipers,Mallow D, Ludwig D, Nilson G.... . Maxillary bone hollowed out .......... AncistrodonAncistrodon *Ancistrodon* is a generic name that is currently part of the synonymy of the following three genera of venomous pit viper... . The vertebrae number 130 to 500—in the European forms 147 (ViperaVipera Summary Common names: Palaearctic vipers,Mallow D, Ludwig D, Nilson G.... ursinii) to 330 (ColuberColuber *Coluber* is a genus of thin bodied, fast moving, colubrid snakes commonly known as racers.... leopardinus). Vertebrae The vertebral columnVertebral column In human anatomy, the vertebral column is a column of vertebrae situated in the dorsal aspect of the torso.... consists of an atlas (composed of two vertebrae) without ribRib In anatomy, ribs are the long curved bones which form the rib cage.... s; numerous precaudal vertebrae, all of which, except the first or first three, bear long, movable, curved ribs with a small posterior tubercle at the base, the last of these ribs sometimes forked; two to ten so-called lumbar vertebraeLumbar vertebrae The lumbar vertebrae are the largest segments of the movable part of the vertebral column, and can be distinguished by the a... without ribs, but with bifurcate transverse processesTransverse processes The transverse processes of a vertebra, two in number, project one at either side from the point where the lamina joins the ... (lymphapophyses) enclosing the lymphatic vessels; and a number of ribless caudal vertebrae with simple transverse processes. When bifid, the ribs or transverse processes have the branches regularly superposed. The centra have the usual cup-and-ball articulation, with the nearly hemispherical or transversely elliptic condyleFacts About Condyle Condyle, a round projection, can refer to:... at the back (procoelous vertebrae), whilst the neural arch is provided with additional articular surfaces in the form of pre- and post-zygapophyses, broad, flattened, and overlapping, and of a pair of anterior wedge-shaped processes called zygosphene, fitting into a pair of corresponding concavities, zygantrum, just below the base of the neural spine. Thus the vertebrae of snakes articulate with each other by eight jointJoint A joint is the location at which two bones make contact.... s in addition to the cup-and-ball on the centrum, and interlock by parts reciprocally receiving and entering one another, like the joints called "tenon-and-mortice" in carpentry. The precaudal vertebrae have a more or less high neural spine which, as a rare exception ( Xenopholis), may be expanded and plate-like above, and short or moderately long transverse processes to which the ribs are attached by a single facet. The centra of the anterior vertebrae emit more or less developed descending processes, or haemapophyses, which are sometimes continued throughout (Fig. II, A), as in Tropidonotus, Vipera, and Ancistrodon, among European genera. In the caudal region, elongate transverse processes take the place of ribs, and the haemapophyses are paired, one on each side of the haemal canal. In the RattlesnakeRattlesnake Rattlesnakes are a group of venomous New World snakes, genera *Crotalus* and *Sistrurus.... s the seven or eight last vertebrae are enlarged and fused into one. Limbs No living snake shows any remains of the pectoral arch, but remains of the pelvisPelvis The pelvis* is the bony structure located at the base of the spine.... are found in:- TyphlopidaeTyphlopidae Typhlopidae is a family of snakes containing 240 species in 6 genera.... : a single bone (ilium ?) on each side. Glauconiidae: ilium, pubis, and ischium, the ischium forming a ventral symphysis, and a rudimentary femur. Boidae: a long ilium, attached to the lower branch of the first bifurcate transverse process of the lumbar vertebrae, bearing three short bones, the longest of which, regarded as the femur, terminates in a claw-like spur which, in males at least, usually appears externally on each side of the vent. Ilysiidae