Muscles of Mastication (week 2)

Question 1

Origin of Masseter muscle (Deep head)

Answer 1

Inner aspect of zygomatic arch and inner border of post. 1/3

Question 2

Origin of Temporalis

Answer 2

Temporal fossa and fascia

Question 3

Insertion of Masseter

Answer 3

Lateral surface of ramus and angle of mandible

Question 4

Insertion of Temporalis muscle

Answer 4

Coronoid process and anterior border of ramus of mandible

Question 5

Action of Temporalis muscle

Answer 5

Elevate and retrude the mandible

Question 6

Action of Masseter muscle (Superficial)

Answer 6

Elevate, protrude the mandible

Question 7

Action of Masseter muscle (Deep head)

Answer 7

Retrude from a protruded position

Question 8

Origin of Lateral pterygoid muscle (Superficial head)

Answer 8

Roof of infratemporal fossa - greater wing of sphenoid

Question 9

Origin of Lateral Pterygoid muscle (Inferior head)

Answer 9

Lateral surface of lateral pterygoid plate

Question 10

Action of Lateral pterygoid muscle

Answer 10

Move mandible to opposite side

Together: Protrude the mandible

Question 11

Origin of Medial Pterygoid muscle

Answer 11

Medial surface of lateral pterygoid plate and maxillary tuberosity

Question 12

Insertion of Medial Pterygoid muscle

Answer 12

Medial surface of ramus of mandible

Question 13

Insertion of Lateral Pterygoid muscle (Superior head)

Answer 13

Pterygoid fovea, TMJ capsule and disc.

Question 14

Insertion of Lateral Pterygoid muscle (Inferior head)

Answer 14

Pterygoid fovea

Question 15

Action of Medial Pterygoid muscle

Answer 15

Elevate and protrude the mandible

Question 16

Origin of Buccinator muscle

Answer 16

Pterygomandibular raphae, buccal alveolar process of mandible and maxilla

Question 17

Insertion of Buccinator

Answer 17

Orbicularis oris fibers

Question 18

Action of buccinator

Answer 18

compress cheeks to push food onto teeth

Question 19

Nerve to Buccinator muscle

Answer 19

CN VII

Question 20

Origin of Masseter muscle (superficial head)

Answer 20

Anterior 2/3 of Zygomatic arch