Unit 4 - Head and Neck: Muscles of Mastication - Masseter and Temporalis (Ex. III)

Question 1

temporalis

Answer 1

O: I temporal line of temporal fossa
I: coronoid process of mandible (apex and M surface)
Inn: mandibular n. (CN V3) via deep temporal nn.
A: vertical fibers - elevate mandible; horizontal fibers - retract mandible; unilaterally move mandible laterally (chewing)

Question 2

masseter

Answer 2

O: superficial head - A 2/3 of zygomatic arch; deep head - P 1/3 of zygomatic arch
I: masseteric tuberosity of mandibular angle
Inn: mandibular n. (CN V3) via masseteric n.
A: elevates and protrudes mandible