Muscles Of Mustication Flashcards
1
Q
What are the muscles of Mastication?
A
- Temporalis
- Masseter
- Lateral Pterygoid
- Medial Pterygoid
2
Q
Temporalis fibers
A
Fan Shaped:
Anterior fibers: vertical
Middle fibers: oblique
Posterior fibers: horizontal
3
Q
Temporalis Origin
A
- Temporal Fossa
- Inferior Temporal Line
- Temporal Fascia
4
Q
Temporalis insertion
A
- Tip and medial surface coronoid surface.
- Anterior border of mandible ramus.
5
Q
Temporalis nerve supply
A
2 deep temporal nerves coming from the anterior division of mandibular nerve.
6
Q
Temporalis Action
A
- Elevation (anterior fibers)
- Retraction (posterior fibers)
7
Q
Masseter fibers
A
- Superficial fibers: oblique.
- Deep fibers: vertical.
8
Q
Masseter origin
A
- Superficial fibers: lower border of zygomatic arch.
- Deep fibers: deep surface of zygomatic arch.
9
Q
Masseter insertion
A
Lateral surface of mandible ramus.
10
Q
Masseter nerve supply
A
Masseteric nerve (anterior division of mandibular nerve)
11
Q
Masseter action
A
- Protraction mandible: superficial fibers.
- Elevation mandible: deep fibers.
12
Q
Lateral Pterygoid origin
A
- Upper head:
Infra-temporal surface and crest of greater wing sphenoid. - Lower head:
Lateral surface of lateral Pterygoid plate.
13
Q
Lateral Pterygoid insertion
A
- Pterygoid fovea of mandible neck.
- Capsule and articular disc of temporomandibular joint.
14
Q
Lateral Pterygoid nerve supply
A
Nerve to lateral Pterygoid (anterior division of mandibular nerve.
15
Q
Lateral Pterygoid action
A
- Depression mandible: lateral Pterygoids both sides.
- Protraction mandible to opposite side: lateral and medial Pterygoids one side.
- Side to side movements lateral and medial Pterygoids of both sides alternatively.
