Head & Neck Anatomy: Muscles Of Mastication

Question 1

How many muscles of mastication are there

Answer 1

4

Question 2

What are the 4 muscles of mastication

Answer 2

Masseter, medial pterygoid, temporalis and lateral pterygoid

Question 3

The 4 muscles of mastication work with the TMJ to accomplish?

Answer 3

Jaw movement

Question 4

All muscles of mastication are innervated by which cranial nerve?

Answer 4

Fifth (V)

Question 5

Masseter has 2 heads, deep and superficial. The superficial head is the bigger one.
Origin: zygomaticus arch
Insertion: angle of the mandible
Action is?

Answer 5

Action os masseter is elevation of the mandible

Question 6

Temporalis is a fan-shaped muscle
Origin: temporal fossa
Insertion: coronoid process of the mandible
Action?

Answer 6

Action of temporalis is elevation and retraction of the mandible with the posterior portion of the muscle

Question 7

Medial pterygoid has 2 heads, deep and superficial. The deep head is the bigger one
Origin: medial surface of the lateral plate of the pterygoid process (deep head) and the maxillary tuberosity (superficial head)
Insertion: angle of the mandible
Action?

Answer 7

Elevates the mandible

Question 8

Lateral pterygoid has two heads, upper and lower
Origin: infratemporal crest of the greater wing of the sphenoid bone(upper head), lateral surface of the pterygoid process (lower head)
Action?

Answer 8

Depress the mandible