Applied anatomy and oral surgery for dental students . accessory muscles are buccinator, platysma myoides,digastric, mylohyoid, geniohyoid. The temporal muscle arises from the temporal fossaand from the temporal fascia. It is inserted into thecoronoid process of the mandible. It is supphed bya branch of the mandibular division of the trifacialnerve. The function of the temporal muscle is to pullthe lower jaw upward and backward. The masseter muscle consists of a superficial portionand a deep portion (Fig. 15). The superficial portionarises from the anterior two-thirds of the lowe
Applied anatomy and oral surgery for dental students . accessory muscles are buccinator, platysma myoides,digastric, mylohyoid, geniohyoid. The temporal muscle arises from the temporal fossaand from the temporal fascia. It is inserted into thecoronoid process of the mandible. It is supphed bya branch of the mandibular division of the trifacialnerve. The function of the temporal muscle is to pullthe lower jaw upward and backward. The masseter muscle consists of a superficial portionand a deep portion (Fig. 15). The superficial portionarises from the anterior two-thirds of the lower border ofthe zygoma. It is inserted into the lower part of the 56 APPLIED ANATOMY outer side of the ramus of the mandible. The deepportion arises from the posterior third of the lowerborder of the zygoma, and from its entire inner is inserted into the upper portion of the outer sideof the ramus of the lower jaw. The nerve-supply ofthe masseter muscle is derived from the mandibulardivision of the trifacial. The superficial portion of the. ^11^ a. Fig. 15.—Masseter muscle (Campbell). masseter draws the lower jaw forward and deep portion draws it backward and upward. The internal pterygoid vcmscle (Fig. 16) arises from theinner surface of the external pterygoid plate and ptery-goid fossa of the sphenoid bone, and from the tuberositiesof the palate and maxillary bones. It is inserted intothe inner side of the ramus and angle of the mandible. MUSCLES AND FASCIM 57 The nerve-supply of the internal pterygoid is derivedfrom the mandibular division of the trifacial. Thismuscle elevates the lower jaw. The external pterygoid muscle arises by two heads,one from the outer surface of the external pterygoidplate of the sphenoid and the other from the zygomaticsurface of the greater wing of the sphenoid. It is n s *^ M 1 > mm ll^ ^^^^B ^^V/jP P-- A Hl^ P^^^ ^^?BpT^^^B^ \ :^J^ lig. 16.—Internal i)terygoid muscle (Campbell). inserted into the anterior part of the n
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Keywords: ., bookauthoriv, bookcentury1900, bookdecade1910, booksubjectanatomy
