Muscles Of Mastication

Question 1

Muscles of Protrusion

Answer 1

Bilateral Contraction:
- inf head of lateral pterygoid
- slight medial pterygoid

• Masseter

Question 2

Muscles of Retrusion

Answer 2

• Temporalis (oblique/ posterior fibers)
• masseter

Question 3

Muscles of Lateral Excursion

Answer 3

Contralateral:
- medial pterygoid
- lateral pterygoid

Ipsilateral
- masseter
- temporalis

ALL UNILATERAL

Question 4

Muscles of Depression

Answer 4

• Suprahyoids: digastric, genohyoid, mylohyoid, stylohyoid
• inf head of lateral pterygoid

Question 5

Muscles of Elevation

Answer 5

Bilateral Contraction:
- Masseter
- Temporalis
- Medial Pterygoid

• sup head of lateral pterygoid helps control tension w/in disc and position during resisted closure