Section 1E

Question 1

Muscles of Mastication receive innervation from what?

Answer 1

Mandibular division of the trigeminal nerve (CN V3)

Question 2

4 muscles of mastication

Answer 2

Masseter (Most force)
Temporalis
Medial Pterygoid
Lateral Pterygoid

Question 3

3 functions of mastication

Answer 3

1. Mechanical breakdown of ingested material by the teeth
2. Chemical breakdown –> ingested material is mixed with saliva
3. Mastication produces a bolus

Question 4

What 3 movements result in the looping pattern of jaw movement

Answer 4

Depression and Elevation
Lateral movement
Anterior-posterior movement

Question 5

3 phases of jaw movement

Answer 5

1. Opening - relaxation of jaw elevators; contraction of jaw openers
2. Closing - jaw elevates and turns to working side
3. Occlusal - jaw nears closure; strongest forces are exerted; represents the longest component of the cycle

Question 6

What other two things move in coordination with maw movements

Answer 6

Tongue

Hyoid bone