. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 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 zygoma
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 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-occipilo rtrlicu- laris, its fibres run across beneath the base of the skull, from the articulation of the lower jaw on the one side, to that on the other. The former pair of muscles will draw the branches of the lower jaw upwards and inwards, the azygos muscle will move them inwards and downwards. The anterior extremities of the lower jaw can be approximated by a little muscle ( Muscles of the Pterygo-Palatine Apparatus of the Rattlesnake (Crotalus durissus). (After Du- vernoy.~) 1, intermaxillary and nasal bones; 2, 2, superior maxillary bones; 3, extern
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