Muscles of Mastication

Question 1

What are the four muscles of mastication?

Answer 1

Temporalis
Masseter
Lateral Pterygoid
Medial Pterygoid

Question 2

What is their nerve supply?

Answer 2

Trigeminal Nerve, Mandibular branch (V3)

Question 3

Function of Temporalis?

Answer 3

Retrusion and elevation of the mandible

Question 4

Function of Masseter?

Answer 4

Protrusion and elevation of the mandible

Question 5

Function of Lateral Pterygoid?

Answer 5

Depression and protrusion of mandible

Question 6

Function of Medial Pterygoid?

Answer 6

Protrusion of mandible

Question 7

What articulation occurs at the Temporo-Mandibular Joint?

Answer 7

Condylar Process articulates with Mandibular fossa, with articular disk in between

Question 8

What prevents posterior dislcation of the mandible?

Answer 8

Mastoid Process and the Lateral Ligament

Question 9

Ligaments of the TMJ?

Answer 9

Lateral
Stylomandibular (attaches at angle)
Sphenomandibular (attaches to lingula/mid mandible)

Question 10

How does the mouth open?

Answer 10

Condylar process must depress and glide forward to sit under the Articular Tubercle