Muscles of Mastication

Question 1

Temporalis origin

Answer 1

Inferior temporal line

Question 2

Temporalis Insertion

Answer 2

Apex and medial surface of coronoid process

Question 3

Temporalis Innervation

Answer 3

Mandibular n. (V3)

Question 4

Temporalis blood supply

Answer 4

Anterior and posterior deep temporal aa.

Question 5

Temporalis action

Answer 5

• Vertical fibers: elevate mandible
• Horizontal fibers: retract mandible
• unilateral fibers: move mandible during mastication

Question 6

Masseter origin

Answer 6

Zygomatic arch and maxillary process of zygomatic bone

Question 7

Masseter insertion

Answer 7

Lateral surface of ramus of mandible

Question 8

Masseter innervation

Answer 8

Masseteric n. from V3

Question 9

Masseter blood supply

Answer 9

Masseteric a.

Question 10

Masseter action

Answer 10

Elevation of mandible

Question 11

Medial pterygoid origin

Answer 11

Deep head

• medial surface of lateral pterygoid plate
• pyramidal process of palatine bone

Superficial head

• tuberosity of maxilla
• pyramidal process of palatine bone

Question 12

Medial pterygoid insertion

Answer 12

Medial surface of mandible near angle

Question 13

Medial pterygoid innervation

Answer 13

Nerve to medial pterygoid from V3

Question 14

Medial pterygoid blood supply

Answer 14

Maxillary a. Pterygoid branches

Question 15

Medial pterygoid action

Answer 15

Elevation and side-to-side movement of mandible

Question 16

Lateral pterygoid origin

Answer 16

Upper head: roof of infratemporal fossa

Lower head: lateral surface of lateral pterygoid plate

Question 17

Lateral pterygoid insertion

Answer 17

• capsule of TMJ

- pterygoid fovea on neck of mandible

Question 18

Lateral pterygoid innervation

Answer 18

Nerve to lateral pterygoid from V3

Question 19

Lateral pterygoid blood supply

Answer 19

Maxillary a. Pterygoid branch

Question 20

Lateral pterygoid action

Answer 20

Protrusion and side-to-side movement of mandible