Muscles of Mastication Flashcards
Temporalis origin
Inferior temporal line
Temporalis Insertion
Apex and medial surface of coronoid process
Temporalis Innervation
Mandibular n. (V3)
Temporalis blood supply
Anterior and posterior deep temporal aa.
Temporalis action
- Vertical fibers: elevate mandible
- Horizontal fibers: retract mandible
- unilateral fibers: move mandible during mastication
Masseter origin
Zygomatic arch and maxillary process of zygomatic bone
Masseter insertion
Lateral surface of ramus of mandible
Masseter innervation
Masseteric n. from V3
Masseter blood supply
Masseteric a.
Masseter action
Elevation of mandible
Medial pterygoid origin
Deep head
- medial surface of lateral pterygoid plate
- pyramidal process of palatine bone
Superficial head
- tuberosity of maxilla
- pyramidal process of palatine bone
Medial pterygoid insertion
Medial surface of mandible near angle
Medial pterygoid innervation
Nerve to medial pterygoid from V3
Medial pterygoid blood supply
Maxillary a. Pterygoid branches
Medial pterygoid action
Elevation and side-to-side movement of mandible
Lateral pterygoid origin
Upper head: roof of infratemporal fossa
Lower head: lateral surface of lateral pterygoid plate
Lateral pterygoid insertion
- capsule of TMJ
- pterygoid fovea on neck of mandible
Lateral pterygoid innervation
Nerve to lateral pterygoid from V3
Lateral pterygoid blood supply
Maxillary a. Pterygoid branch
Lateral pterygoid action
Protrusion and side-to-side movement of mandible
