. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. 296 PHYSIOLOGY OF THE DOMESTIC ANIMALS. or where it is inserted into the jaw, and its posterior extremity seized with a pair of artery forceps and gradually cleared back to its insertion in the temporal bone and surrounded by a ligature When it is assured there is nothing bu muscular structure in the g/asp of the ligature, it is pushed back to the temporal bone and t ed and the digastric muscle divided in front of the ligature and removed. On carefully tearing away the connective tissue at the base of he w
. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. 296 PHYSIOLOGY OF THE DOMESTIC ANIMALS. or where it is inserted into the jaw, and its posterior extremity seized with a pair of artery forceps and gradually cleared back to its insertion in the temporal bone and surrounded by a ligature When it is assured there is nothing bu muscular structure in the g/asp of the ligature, it is pushed back to the temporal bone and t ed and the digastric muscle divided in front of the ligature and removed. On carefully tearing away the connective tissue at the base of he wound and drawing back the submaxillary gland, there is exposed a triangular cavity (Fg. 121) This space is limited above and behind by the under surface of the submaxil- lary gland, into thehylum of which enter the artery, chorda tympani and syrn- pathetic nerve fibres, and the glandular duct Its lower margin is formed by the genio-hyoid muscle, and its upper border by the ramus of the jaw and the masseter muscle. The anterior portion of its floor is formed by the transverse fibres of the mylo-hyoid muscle, on which ramify the branches of the mylo-hywd nerve. At the posterior portion of this space the external carotid artery enters and runs along the base of the triangle, giving off first the lingual and then the. Fig. 121.—Pakts Exposed in Operations on the Submaxillaky Gland of the Dog. {Bernard. M, anterior portion of digastric muscle elevated with a tenaculum; M', posterior extremity of the digastric raised up so as to show the carotid artery, (t, and the sympathetic filaments ; G, submaxillary gland elevated to show its posterior surface : H, submaxillary and sublingual ducts; J, external jugular vein; J', posterior branch; J", anterior branch: D, glandular vein ; F, origin of inferior glandular artery; P. hypoglossal nerve: L, lingual nerve; T, chorda tympani; S S', divided mylo-hyoid muscle; U, masseter muscle at angle of lower jaw; Z, origin of mylo-hyoid nerve.
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