. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. REPTILIA. 283 portion of the temporal fossa, until it meets the jaw into which it is inserted, either separately or conjointly with the anterior temporal. The posterior temjwral (/), which is al- ways distinct from "the two others, descends from the very posterior part of the temporal fossa, along the zygomatic bone (tympanic} (fig. 205, 7), to the lower, into which it is inserted behind the two others. The mouth is opened by means of a muscle Fig. 204. 206, v), which passes transversely from one to the other. This
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. REPTILIA. 283 portion of the temporal fossa, until it meets the jaw into which it is inserted, either separately or conjointly with the anterior temporal. The posterior temjwral (/), which is al- ways distinct from "the two others, descends from the very posterior part of the temporal fossa, along the zygomatic bone (tympanic} (fig. 205, 7), to the lower, into which it is inserted behind the two others. The mouth is opened by means of a muscle Fig. 204. 206, v), which passes transversely from one to the other. This muscle, which is tendinous Fig. The Muscles of the Head of the Rattlesnake. a a, poison gland and its excretory duct; e, anterior temporal muscle; f, posterior temporal muscle; g, digastricus ; h, external pterygoid muscle; »', middle temporal muscle; 7, articulo- maxillary ligament which joins the aponeurotic capsule of the poison gland ; r, the cervical angular muscle; t, vertebro-mandibular muscle; u, costo- maiidibular muscle. (After Duvernoy.) analogous to the digastric (g), which arises from the whole length ot tlie posterior aspect of the zygomatic (tympanic] bone, and ter- minates on each side at the angle of the jaw beyond its articulation. There is likewise a cutaneous muscle which powerfully contributes to depress the lower jaw, something like the j)latysma my- oides ; this has been named the costo-maridibu- laris (u}. This, moreover, is assisted by a strong fasciculus (t), derived from the spinous processes of the vertebrae immediately be- hind the cranium, which has been distin- guished by the name of the vertebro-mandi- bularis. Two sets of muscles are appropriated to the movement of the zygomatic (tympanic) bone which supports the lower jaw : of these one arises on each side from the back of the occipital region, and is inserted into the lower portion of the bone above referred to. The other (fig. 205, m) is azygos, and has been named by M. Duges stib-occ
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