. Cunningham's Text-book of anatomy. Anatomy. MUSCLES OF MASTICATION. 457 fovea pterygoidea on the anterior aspect of the neck of the mandible (Figs. 403 and 404, p. 455), and (2) the articular disc and capsule of the mandibular articulation. This muscle is covered by the insertion of the temporal muscle and the coronoid process of the mandible, and is usually crossed by the internal maxillary artery. It conceals the mandibular branch of the trigeminal nerve, and the pterygoid origin of the internal pterygoid muscle. M. Pterygoideus Internus.—The internal pterygoid muscle, placed beneath the e
. Cunningham's Text-book of anatomy. Anatomy. MUSCLES OF MASTICATION. 457 fovea pterygoidea on the anterior aspect of the neck of the mandible (Figs. 403 and 404, p. 455), and (2) the articular disc and capsule of the mandibular articulation. This muscle is covered by the insertion of the temporal muscle and the coronoid process of the mandible, and is usually crossed by the internal maxillary artery. It conceals the mandibular branch of the trigeminal nerve, and the pterygoid origin of the internal pterygoid muscle. M. Pterygoideus Internus.—The internal pterygoid muscle, placed beneath the external pterygoid muscle and the ramus of the mandible, has likewise a double origin—(1) from the deep surface of the lateral pterygoid lamina and the pyramidal process of the palate bone, and (2) by a stout tendon from the tuberosity Temporal muscle (reflected). / External pterygoid ' Internal pterygoid Pterygomandibular raph Fig. 407.—The Pterygoid Muscles of the Right Side. of the maxilla. Its two heads of origin embrace the inferior fibres of the external pterygoid muscle. It is quadrilateral in form, and is directed downwards, laterally, and backwards over the auditory tube and the tensor and levator muscles of the palate, to be inserted into a triangular impression on the medial surface of the mandible, between the mylo-hyoid groove and the angle of the bone (Fig. 404, p. 455). This muscle is covered by the ramus of the mandible and temporal muscle, and partially by the external pterygoid muscle. In contact with its superficial surface are the spheno-mandibular ligament, and the inferior alveolar and lingual nerves and their accompanying vessels. The muscle conceals the tensor veli palatini and the wall of the pharynx (superior constrictor). Nerve-Supply.—The mandibular division of the trigeminal nerve supplies all the muscles of mastication except the buccinator, which is supplied by the facial nerve. The internal pterygoid muscle is supplied by the nerve before
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
