Muscles of Mastication (acting on TMJ) Flashcards Preview

VCU Anatomy Test 2 > Muscles of Mastication (acting on TMJ) > Flashcards

Flashcards in Muscles of Mastication (acting on TMJ) Deck (12):
1

What 4 movements can the mandible do?

1. depression
2. elevation
3. protraction
4. retraction

2

What are the 4 muscles of mastication?

1. temporalis m.
2. masseter m.
3. lateral pterygoid m.
4. medial pterygoid m.

3

Temporalis m.
O:
I: (2)

O: temporalis fossa

I:
1) coronoid process
2) anterior border of the ramus of mandible

4

Temporalis m.
Innerv:
Function:

Innerv: V3-mandibular division of the trigeminal n.

Function:
1) closes the jaw
2) posterior portion retracts the mandible

5

Masseter m.
O: (2)
I:

O:
1) inferior margin & deep surface of the zygomatic arch
2) zygomatic process of maxilla

I: angle & ramus of the mandible

6

Masseter m.
Innerv:
Function:

Innerv: V3-mandibular division of the trigeminal n.

Function: closes the jaw

7

Lateral Pterygoid m.
O: (2)

O:
1) superior head: infratemporal surface of the greater wing of the sphenoid bone
2) inferior head: lateral surface of the lateral pterygoid plate

8

Lateral Pterygoid m.
Innerv:
Function:

Innerv: V3-mandibular division of the trigeminal n.

Function:
1) protrudes the mandible
2) moves mandible from side to side

9

Medial Pterygoid m.
O:
I:

O: medial surface of the lateral pterygoid plate
I: medial surface of the ramus & angle of the mandible

10

Medial Pterygoid m.
Innerv.:
Function:

Innerv: V3-mandibular division of the trigeminal n.

Function:
1) closes the jaw
2) acting alone it pulls the chin to the opposite side
3) when acting alternately it causes grinding

11

What artery in the face is derived from the external carotid artery?

facial a.

12

Which is NOT a description of the Facial Artery?
1. crosses the inferior mandible just anterior to the masseter m.
2. usually grooves bone; can feel the pulse here
3. crosses mandible only
4. runs deep to zygomaticus major and reaches the eye

3. crosses mandible only
*crosses mandible, buccinator, & maxilla