muscles of mastication

Question 0

Temporalis distal

Answer 0

Narrow attachment to tip and medial surface of coronoid process and anterior border of ramus of mandible

Question 1

Temporalis Proximal

Answer 1

Triangular muscle with broad attachment to floor of temporal fossa and deep surface of temporalis fascia

Question 2

Temporalis innervation

Answer 2

Via deep temporal nerves (Anterior trunk of mandible nerve CN V3)

Question 3

Temporalis action

Answer 3

Elevates mandible, closing jaws; posterior, more horizontal fibers are retractors of mandible

Question 4

Masseter Proximal

Answer 4

Quadrate muscle attaching to inferior border and medial surface of maxillary process of zygomatic bone and the zygomatic arch

Question 5

Masseter distal

Answer 5

Angle and lateral surface of ramus of mandible

Question 6

Masseter innervation

Answer 6

Via masseteric nerve (Anterior trunk of mandible nerve CN V3)

Question 7

Masseter action

Answer 7

Elevates mandible; superficial fibers make limited contribution to protrusion of mandible

Question 8

Lateral Pterygoid Proximal

Answer 8

Triangular 2-headed muscle from (1) infratemporal surface and crest of greater wing of sphenoid and (2) lateral surface of lateral pterygoid plate

Question 9

Lateral Pterygoid distal

Answer 9

Superior head attaches to joint capsule (primarily) and articular disc of TMJ, Inferior head attaches primarily to pterygoid fovea on anteromedial aspect of neck of condyloid process of mandible

Question 10

Lateral Pterygoid innervation

Answer 10

Anterior trunk of mandible nerve CN V3) Via nerves to lateral pterygoid

Question 11

Lateral Pterygoid action

Answer 11

Acting bilaterally, protracts mandible and depresses chin, acting unilaterally swings jaw toward contralateral side; alternate unilateral contraction produces larger lateral chewing movements

Question 12

Medial Pterygoid Proximal

Answer 12

Quadrangular two-headed muscle from (1) medial surface of lateral pterygoid plate and pyramidal process of palatine bone and 2 tuberosity of maxilla

Question 13

Medial Pterygoid distal

Answer 13

Medial surface of ramus of mandible inferior to mandibular foramen

Question 14

Medial Pterygoid innervation

Answer 14

Anterior trunk of mandibular nerve CN V3 via nerve to medial pterygoid

Question 15

Medial Pterygoid action

Answer 15

Acts synergistically with masseter to elevate mandible, contributes to protrusion; alternate unilateral activity produces smaller grinding movements