Muscles - Mastication

Question 1

Which pharyngeal arch is associated with the mastication muscles?

Answer 1

1st pharyngeal arch.

Question 2

Masseter

Attachments?

Actions?

Innervation?

Answer 2

Origin:

Superficial - maxillary process of zygomatic bone

Deep - zygomatic arch of temporal bone

Insertion - ramus of the mandible

Action - elevates the mandible to close the mouth

Innervation - masseteric nerve (branches of the mandibular nerve)

Question 3

Temporalis

Attachments?

Actions?

Innervation?

Answer 3

Origin - temporal fossa

Insertion - coronoid process and ramus of the mandible

Actions - elevates the mandible; retracts the mandible posteriorly

Innervation - temporal nerves (branches of the mandibular nerve)

Question 4

Medial pterygoid muscle

Attachments?

Actions?

Innervations?

Answer 4

Origin - medial surface of lateral pterygoid plate; maxillary tuberosity; pyramidal processes of palatine bones

Insertion - medial surface of ramus and angle of the mandible

Actions - laterally moves and protracts mandible

Innervation - nerve to medial pterygoid (a branch of the mandibular nerve)

Question 5

Lateral pterygoid muscle

Attachments?

Actions?

Innervation?

Answer 5

Origin -

Superior head - greater wing of sphenoid

Inferior head - lateral pterygoid plate of the sphenoid

Insertion - neck of mandible

Actions -

Protract the mandible anteriorly (bilaterally)

Side to side movement (unilateral)

Innervation - mandibular nerve