. The anatomy of the domestic animals . Veterinary anatomy. 262 FASCIA AND MUSCLES OF THE HORSE medially, the great cornu of the hyoid bone, the pharynx, the larynx, the tensor palati, mylo-hyoideus, digastricus, and stylo-hyoideus muscles, the guttural pouch, the external maxillary vessels, the ninth and twelfth nerves, the mandibular salivary gland, the mandibular and parotid ducts, and the mandibular and pharyngeal lymph- elands. Blood-supply.—Internal maxillary, niasseteric, and inferior alveolar arteries. Nerve-supply.—INIandibular nerve. 4. Pterygoideus lateralis (s. externus).—This musc
. The anatomy of the domestic animals . Veterinary anatomy. 262 FASCIA AND MUSCLES OF THE HORSE medially, the great cornu of the hyoid bone, the pharynx, the larynx, the tensor palati, mylo-hyoideus, digastricus, and stylo-hyoideus muscles, the guttural pouch, the external maxillary vessels, the ninth and twelfth nerves, the mandibular salivary gland, the mandibular and parotid ducts, and the mandibular and pharyngeal lymph- elands. Blood-supply.—Internal maxillary, niasseteric, and inferior alveolar arteries. Nerve-supply.—INIandibular nerve. 4. Pterygoideus lateralis (s. externus).—This muscle is considerably smaller than the preceding one, and is situated lateral to its upper part. Origin.—The lateral surface of the pterygoid process of the sphenoid bone. Insertion.—The medial surface of the neck, the medial part of the anterior border of the condjde of the mandible and the articular disc. Action.—Acting together, to draw the lower jaw forward; acting singly, to Ethmo- turhinates Dorsal meatus Septum of frontal sinuses meatus. ^y/o'hyoideuS 7 r -Occipito- ularis ^ Digastricus, posterior belly Digastricus, anterior helly Intermediate tendon Fig. 204.—S.^GiTTAL Section of Head of Horse, Showing Deep Pterygo-m-vndibular Region and Nasal and Cranial Cavities. 1, Cerebral compartment of cranial cavity; 2, cerebellar compartment of same; 5, tentorium osseum; 4. ten- torium cerebeili; 5, sphenoidal sinus; 6, hamulus of pterygoid bone-tendon of tensor palati cut off short at anterior border of hamulus; 7, mylo-glossus. The olfactory mucous membrane is shaded. move the jaw also toward the side opposite to the muscle acting. The latter action is due to the fact that the origin is nearer to the mediali plane than the insertion. Structure.—The muscle is almost entirely fleshj-,"and the fibers are almost longitudinal in direction. Some of them are inserted into the edge of the articular disc. Relations.—Laterally, the temporo-mandibular articul
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