Lecture 21 - Muscles of Mastication

Question 1

Masseter

Answer 1

O- zygomatic arch (inner/medial surface + inferior
I - Angle + Ramus of mandible
(outer surface and post. edge of ramus)
N- C-V Trigeminal (Mandibular)
A- Elevates Mandible- slight protraction

Question 2

Temporalis

Answer 2

O- temporal fossa
-parietal bone
-frontal bone
-temporal bone
-sphenoid
- temporal fascia
I - Coronoid process - of mandible
- ant. ramus of mandible
N - C-V Trigeminal (Mandibular)
A - Elevate + Retract mandible
- assists in side to side mvmt of mandible, same side

Question 3

Medial Pterygoid

Answer 3

O - medial surf. of lateral pterygoid plate
(sphenoid bone + maxilla tuberosity
I - angle + ramus of mandible ( inner surface)
N- C-V trigeminal ( mandibular division)
A - elevates + protracts mandible
- Moves mandible to the opposite side