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TEMPORAL REGION Temporal Lines Superior: For attachment of temporalis fascia. Inferior: For attachment of temporalis muscle. Boundaries Superior and posterior boundary: Inferior temporal line. Anterior boundary: Frontal process of zygomatic. Inferior: Zygomatic arch. Floor Greater wing of sphenoid. Squamous temporal. Frontal. Parietal. Contents Temporalis muscle. Deep temporal nerve and arteries. Zygomaticofacial nerve. Muscles of Mastication General characteristics: All innervated by mandibular branch of CN V. Masseter: Zygomatic bone to lateral surface of ramus and coronoid process. Elevates and protracts mandible. Muscles of Mastication Lateral pterygoid: Lateral pterygoid plate and sphenoid to front of mandible and TMJ. Protracts mandible; depresses chin (bilateral). Grinding (unilateral). Muscles of Mastication Medial pterygoid: Lateral pterygoid plate and maxilla to medial surface of mandible near angle. Elevates, protracts (bilateral). Grinding (unilateral). Muscles of Mastication Temporalis: Temporal fossa and fascia to coronoid process. Elevates and retracts mandible. Temporomandibular Joint Synovial joint: Between head of mandible (condyloid process) and mandibular fossa of temporal bone. Intervening cartilage: Divides joint into superior and inferior compartments. Allows mandible to protract and retract as well as elevate and depress. TMJ Ligaments Temporomandibular ligament: Base of zygomatic process to mandibular neck. Stylomandibular ligament: Styloid process to angle of mandible. Runs between parotid and submandibular glands. TMJ Ligaments Sphenomandibular ligament: Sphenoid spine to mandibular lingula. Lies medial to TMJ.