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

Question 1

S head of L pterygoid

Answer 1

O: infratemporal crest of greater wing of sphenoid bone
I: articular disk of TMJ
Inn: mandibular n. (CN V3) via L pterygoid n.
A: bilaterally protrudes mandible by pulling articular disk forward; unilaterally moves mandible laterally (chewing)

Question 2

I head of L pterygoid

Answer 2

O: L surface of L pterygoid plate
I: condylar process of mandible
Inn: mandibular n. (CN V3) via L pterygoid n.
A: bilaterally protrudes mandible by pulling articular disk forward; unilaterally moves mandible laterally (chewing)

Question 3

superficial head of M pterygoid

Answer 3

O: tuberosity of maxilla
I: pterygoid tuberosity on M surface of mandibular angle
Inn: mandibular n. (CN V3) via M pterygoid n.
A: elevates mandible

Question 4

deep head of M pterygoid

Answer 4

O: M surface of L pterygoid plate and pterygoid fossa
I: pterygoid tuberosity on M surface of mandibular angle
Inn: mandibular n. (CN V3) via M pterygoid n.
A: elevates mandible