Muscles Of Mastication Acting On The Mandible Flashcards Preview

Anatomy Of The Head And Neck > Muscles Of Mastication Acting On The Mandible > Flashcards

Flashcards in Muscles Of Mastication Acting On The Mandible Deck (16)
Loading flashcards...
0
Q

Insertion of the temporalis

A

Narrow attachment to tip and medial surface of Coronoid process and anterior border of ramus of mandible

1
Q

Origin of the temporalis

A

Triangular muscle with broad attachment to floor of temporal fossa and deep surface of temporalis fascia

2
Q

Innervation of the temporalis

A

Anterior trunk of mandibular nerve (CN V3) via deep temporal nerves

3
Q

Action of temporalis

A

Elevates mandible, closing jaws

Posterior, more horizontal fibers are retractors of mandible

4
Q

Origin of the masseter

A

Quadrate muscle attaching to inferior border and medial surface of maxillary process of zygomatic bone and the zygomatic arch

5
Q

Insertion of the masseter

A

Angle and lateral surface of ramus of mandible

6
Q

Innervation of masseter

A

Anterior trunk of mandibular nerve (CN V3) via masseteric nerve

7
Q

Actions of the masseter

A

Elevates mandible

Superficial fibers make limited contribution to protrusion of mandible

8
Q

Origin of the lateral pterygoid

A

Triangular two-headed muscle from (a) infratemporal surface and crest of greater wing of sphenoid and (b) lateral surface of lateral pterygoid plate

9
Q

Insertion of the lateral pterygoid

A

Superior head attaches primarily to joint capsule and articular disc of TMJ
Inferior head attaches primarily to pterygoid fovea on anteromedial aspect of neck of condyloid process of mandible

10
Q

Innervation of the lateral pterygoid

A

Anterior trunk of mandibular nerve (CN V3) via nerves to lateral pterygoid

11
Q

Action of lateral pterygoid

A

Acting bilaterally, protracts mandible and depresses chin
Acting unilaterally, swings jaw toward contralateral side
Alternate unilateral contraction produces larger lateral chewing movements

12
Q

Origin of the medial pterygoid

A

Quadrangular two-headed muscle from (a) medial surface of lateral pterygoid plate and pyramidal process of palatine bone and (b) tuberosity of maxilla

13
Q

Insertion of the medial pterygoid

A

Medial surface of ramus of mandible, inferior to mandibular foramen
In essence, a “mirror image” of the ipsilateral masseter, the two muscles flanking the ramus

14
Q

Innervation of the medial pterygoid

A

Anterior trunk of the mandibular nerve (CN V3)via nerve to medial pterygoid

15
Q

Action of the medial pterygoid

A

Acts synergistically with masseter to elevate mandible
Contributes to protrusion
Alternate unilateral activity produces smaller grinding movements