Mastication muscles

Question 1

What is the action of the temporalis?

Answer 1

raises and retracts mandible, closes jaw

Question 2

What is the innervation of the temporalis?

Answer 2

trigeminal nerve

Question 3

What is the action of the masseter?

Answer 3

raises mandible, closes jaw

Question 4

What is the innervation of the masseter?

Answer 4

trigeminal nerve

Question 5

What is the action of the medial pterygoid?

Answer 5

closes jaw, aids in sideways movement of jaw (grinding) with lateral pterygoid

Question 6

What is the innervation of the medial pterygoid?

Answer 6

trigeminal nerve

Question 7

What is the action of the lateral pterygoid?

Answer 7

opens and protrudes mandible from side to side

Question 8

What is the innervation of the lateral pterygoid?

Answer 8

trigeminal nerve

Question 9

What muscle raises and retracts the mandible, closes the jaw?

Answer 9

temporalis

Question 10

What muscle raises the mandible and closes the jaw?

Answer 10

masseter

Question 11

What muscle closes the jaw and aids in sideways movement of the jaw (grinding)?

Answer 11

medial pterygoid

Question 12

What muscle opens and protrudes the mandible from side to side?

Answer 12

lateral pterygoid

Question 13

Name all 4 of the mastication muscles.

Answer 13

temporalis, masseter, medial pterygoid, lateral pterygoid