Temporal and Infratemporal Fossae Muscles Flashcards Preview

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Flashcards in Temporal and Infratemporal Fossae Muscles Deck (16)
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1

Temporalis Origin

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

2

Temporalis Insertion

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

3

Temporalis Innervation

Anterior trunk of mandibular nerve(CN V3) Via deep temporal branches

4

Temporalis Action

Elevates mandible, closing jaws; posterior, more horizontal fibers are 1 retractors of mandible

5

Masseter Origin

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

6

Masseter Insertion

Angle and lateral surface of ramus of mandible

7

Masseter Innervation

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

8

Masseter Action

Elevates mandible, closing jaws; superficial fibers make limited contribution to protrusion of mandible

9

Medial Pterygoind Origin

Quadrangular two-headed muscle from (1) medial surface of lateral pterygoid plate and pyramidal process of palatine bone and (2) tuberosity of maxilla

10

Medial Pterygoind Insertion

Medial surface of ramus of mandible, inferior to mandibular foramen; in essence, a "mirror image" of ipsilateral masseter, two muscles flanking ramus

11

Medial Pterygoind Innervation

Anterior trunk of mandibular nerve(CN V3) Via medial pterygoid nerve

12

Medial Pterygoind Action

Acts synergistically with masseter to elevate mandible; contributes to protrusion; alternate unilateral activity produces smaller grinding movements

13

Lateral Pterygoid Origin

triangular two-headed muscle from (1) infratemporal surface and crest of greater wing of sphenoid and (20 lateral surface of lateral pterygoid plate

14

Lateral Pterygoid Insertion

Upper 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

15

Lateral Pterygoid Innervation

Anterior trunk of mandibular nerve(CN V3) Via lateral pterygoid nerve

16

Lateral Pterygoid Action

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