. Cunningham's Text-book de l'anatomie. L'anatomie. M. triangularis (origine) M. quadratus (labii inferioris) (origine) M. mentalis (origine) Av muscle platysma"e = (insertion) Fig. 403.-Muscle-Attachments à la face latérale de la mandibule. dirigé vers le bas et en arrière vers l'angle de la mandibule ; les fibres sont plus orienté verticalement vers le bas. Le muscle est inséré par des fibres tendineuses et charnue dans la surface latérale du ramus et l'angle de la mandibule et le processus de coronoid (Fig. 403). Les fibres les plus profondes se mélangent avec les fibres du muscle temporal sous- jacent. Le muscle est

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. Cunningham's Text-book of anatomy. Anatomy. M. triangularis (origin) M. quadratus (labii inferioris) (origin) M. mentalis (origin) Platysma Av"e= (insertion) Fig. 403.—Muscle-Attachments to the Lateral Aspect of the Mandible. directed downwards and backwards towards the angle of the mandible; the deeper fibres are directed vertically downwards. The muscle is inserted by fleshy and tendinous fibres into the lateral surface of the ramus and angle of the mandible and the coronoid process (Fig. 403). The deepest fibres blend with the fibres of the sub- jacent temporal muscle. The muscle is partially concealed on the face by the parotid gland, ac- cessory parotid gland, and parotid duct; by the ex- ternal maxillary artery; the branches of the facial nerve; and by the zygo- matic and platysma muscles. It conceals the ramus of the jaw, and, at its an- terior border, is separated from the buccinator muscle by the corpus adiposum buccce. M. Temporalis.—The temporal muscle is a fan-shaped muscle arising from the whole area of the temporal fossa, as well as from the temporal fascia which covers it. Its converging fibres pass beneath the zygomatic arch. The muscle is in- serted into the deep surface and apex of the coronoid process, and into the anterior border of the ramus of the mandible (Figs. 403 and 404). The origin of the muscle is concealed by the temporal fascia. As it passes to its in- sertion the muscle is concealed by the zygo- matic arch, the masseter muscle, and the coronoid process of the mandible. It is separated from the external pterygoid in a majority of cases by the internal maxillary artery. The masseteric nerve and vessels appear at its posterior border; the buccinator nerve and vessels at its anterior border. M. Pterygoideus Externus.—The external pterygoid muscle is deeply placed under cover of the temporal muscle, in the infra-temporal fossa. It arises by two heads, superior and inferior. The superior head is attached to the infra-temporal s

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