Archive image from page 304 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 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
Archive image from page 304 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 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. 203. 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 (
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