Muscles of mastication

Question 1

Masseter

Answer 1

Innervation - v3
Superficial originates from maxillary part of zygote
Deep originates from temporal part of zygoma
Insertion onto ramus
Action - elevates the mandible closing the mouth

Question 2

Temporalis

Answer 2

Innervation - v3
Originates from the temporal fossa
Insertion onto coronoid process
Action - elevates and retracts the mandible

Question 3

Medial pterygoid

Answer 3

Innervation - v3
Superficial originates - maxillary tuberosity and pyramidal process of palatine
Deep originates - medial aspect of lateral pterygoid plate of sphenoid bone
Insertion - ramus of mandible near angle
Action - elevates mandible

Question 4

Lateral pterygoid

Answer 4

Innervation - v3
Superior originates - greater wing of sphenoid
Inferior originates - lateral pterygoid plate of sphenoid
Insertion - neck of mandible
Action - pulls jaw forward