. The anatomy of the domestic animals. Veterinary anatomy. 262 FASCIA AND MUSCLES OF THE HORSE medially, the great cornu of the hyoid hone, the pharj'nx, 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, masseteric, and inferior alveolar arteries. Nerve-supply.—Mandibular nerve. 4. Pterygoideus lateralis (s. externus).—This muscle
. The anatomy of the domestic animals. Veterinary anatomy. 262 FASCIA AND MUSCLES OF THE HORSE medially, the great cornu of the hyoid hone, the pharj'nx, 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, masseteric, and inferior alveolar arteries. Nerve-supply.—Mandibular nerve. 4. Pterygoideus lateralis (s. externus).—This muscle is considerably smaller than the jorcceding one, and is situated lateral to its upper part. Origin.—The lateral surface of the pterj^goid process of the sphenoid bone. Insertion.—The medial surface of the neck, the medial part of the anterior border of the condyle of the mandible and the articular disc. Action.—Acting together, to draw the lower jaw forward; acting singly, to / Ethmo- turbinates Dorsal meatus Dorsal turbinate Middle meatus Ventral turbinate Ventral meatus. Fig. 264.—Sagittal Sectiox of H Region and OF Horse, Showing Deep Pterygo-m Cranial Cavities. 1. Cerebral compartment of cranial ca\-ity; 2, cerebellar compartment of same; 5, tentorium ( torium cerebelli; 5, sphenoidal sinus; (?. hamulus of pterygoid bone-tendon of tensor palati cut off short at anterior border of hamulus; 7, myio-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 median plane than the insertion. Structure.—The muscle is almost entirely fleshy, and the fibers are almost longitudinal in direction. Some of them are inserted into the edge of the articular disc. Relatiojis.—Laterally, the temporo-mandibular articulation and the temporalis muscle; medially, the medial pterygoid and tensor palati muscles. The internal maxillary artery crosses
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