Muscle of Mastication

Question 1

Number of muscles of mastication

Answer 1

4

Question 2

Muscles of mastication are

Answer 2

1. Masseter
2. Temporalis
3. Lateral pterygoid
4. Medial pterygoid

Question 3

These muscles develop from _________

Answer 3

Mesoderm of first pharyngeal arch

Question 4

These muscles develop from _________

Answer 4

Mesoderm of first pharyngeal arch

Question 5

These muscles are innervated by

Answer 5

Third division of the trigeminal nerve, the mandibular nerve (CN V3)

Question 6

Masseter

Answer 6

It’s quandrangular in shape. It lies superficial to the pterygoid and temporalis muscle

Question 7

Parts of masseter

Answer 7

It has two parts namely: deep and superficial

Question 8

Origin of masseter muscle

Answer 8

Superficial part: zygomatic process of the maxilla and anterior 2/3 of the lower border of the zygomatic arch
Deep: originates from the zygomatic arch if the temporal bone (posterior 1/3)

Question 9

Insertion of masseter

Answer 9

Rsmus of the mandible and angle of the mandible

Question 10

Actions of masseter

Answer 10

Elevation of the mandible (closes the mouth)
Assists in protraction

Question 11

Innervation of the masseter

Answer 11

Masseteric nerve of the mandibular diviosn of the trigeminal nerve