1 E: Mastication Flashcards Preview

Digestion > 1 E: Mastication > Flashcards

Flashcards in 1 E: Mastication Deck (24):
1

Where are the muscles of mastication located?
What do they attach to?

-At various depths in the parotid and infra temporal regions of the face

-They attach to the mandible & receive their MOTOR innervation

2

What controls the motor innervation of the muscles of mastication?

The mandibular division of the trigeminal nerve CN V3

3

What are the muscles of mastication and name the most powerful one?

1) Masseter (Most powerful)
2) Temporalis
3) Medial Pterygoid
4) Lateral Pterygoid

4

What is the innervation of the Masseter muscle?

Masseteric branch of mandibular nerve

5

What is the innervation of the Temporalis?

Deep temporal branches of the mandibular nerve

6

What is the innervation of the Lateral Pterygoid?

Lateral Pterygoid branch of the mandibular nerve

7

What is the innervation of the Medial Pterygoid ?

Medial Pterygoid branch of the mandibular nerve

8

What is the action of the Masseter muscle?

Closes jaw by elevating mandible

9

What is the action of the Temporalis?

Elevates mandible and closes jaw

10

What is the action of the Lateral Pterygoid?

Opens mouth.

-Together= protrudes
-Alternately= grinding action

11

What is the action of the Medial Pterygoid ?

Elevates mandible, closing jaw

Together= protrudes mandible
Solo= protrudes one side

12

What is Mastication?

The mechanical breakdown of ingested material by the teeth

13

What is chemical breakdown?

Ingested material is mixed w/ saliva

14

What is a bolus?

A soft, cohesive mass to be swallowed

15

What is the Masticatory Cycle?

Complex 3-dimensional movement resulting in a "looping" pattern

16

List the movements involving the jaw

1) Depression & elevation
2) Lateral movement
3) Anterior-posterior movement

***The TONGUE and HYOID BONE move in coordination w/ jaw movement

17

What are the 3 phases of jaw movement?

1) Opening
2) Closing
3) Occlusal

18

What occurs during "opening"?

The relaxation of jaw elevators; contraction of jaw openers

19

What occurs during "closing"?

Jaw elevates & turns to working side

20

What occurs during "Occlusal phase" ?

Jaw nears closure; STRONGEST forces are exerted; represents the LONGEST comment of the cycle

21

What is involved in Protrusion?

Lateral pterygoid assisted by medial pterygoid

22

What is involved in Retraction?

Posterior fibers of termporalis, deep part of masseter, & geniohyoid and digastric

23

What is involved in Elevation?

Temporalis, masseter, medial pterygoid

24

What is involved in Depression ?

Gravity, Digastric, geniohyoid, & mylohyoid muscles