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Flashcards in Muscles of mastication Deck (21)
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1

Attached to the more moveable structure

Insertion

2

Movement accomplished by muscle contraction

Action

3

Process of mastication

Ingestion of food,
Muscles coordinate to place food between opposing teeth

Under control of nervous system

4

T or F
Muscles of mastication are all paired..

True

5

Masseter origins:
Superficial and Deep

Superficial-anterior 2/3s inferior zygoma
Deep-posterior 1/3s medial of zygoma

6

Masseters insertions:
Superficial and Deep

Sup- lower 1/2 of external surface of Ramus, angle of mandible.
Deep- lower 1/2 of external Ramus.

7

Masseter action

Elevation of the mandible, raises jaw, closes mouth

8

Masseter hypertrophy-

Increase in the cellular volume
Cells get bigger, bigger jaw.
Unilaterally and bilaterally

9

Temporalis origin

Temporal Fossa

10

Temporalis insertion

Coronoid process of mandible

Starts at temporal fossa and runs medically by zygomatic arch.

11

Temporalis action

Elevation of mandible
Posterior fibers: retrusion of mandible

Note: not a strong muscle

12

Temporalis muscle shape:

Fan shaped.

Runs medial by zygoma arch.

13

Medial pterygoid origin

Medial of lateral pterygoid plate

14

Medial pterygoid insertion

Medial portion of mandibular angle

15

Medial pterygoid action

Elevation of muscles,
Elevate and closes mouth

16

With action of masseter, creates a "supportive sling" for mandible

Medial pterygoid

17

Lateral pterygoid origins

Lateral of lateral pterygoid plate
(Sphenoid greater wing)

18

Lateral pterygoid insertions

Anterior of condyle neck

*Some fibers to TMJ capsule

19

Lateral pterygoid actions

Slight depression of mandible,
Protrusion of mandible,
Shifting of mandible (side to side)

20

Origin

Attached to the least moveable structure

21

Muscles of mastication blood supply

Branches of the maxillary artery