Muscles of Mastication (MT)

Question 1

Masseter Origin and Insertion

Answer 1

Origin:
- Zygomatic Arch

Insertion:
- Lateral Angle of the Mandible

Question 2

Temporalis Origin and Insertion

Answer 2

Origin:
- Temporal Fossa and Temporal Fascia

Insertion:

• Coronoid Process
• Ramus of the Mandible to to 3rd Molar

Question 3

Medial Pterygoid Origin (Deep Head and superficial Head) and Insertion

Answer 3

Deep Origin:

• Medial Side of Lateral Pterygoid
• Pyrimidal Process of Palatine Bone

Superficial Head:
- Tuberosity and Pyrimidal Process of the Palatine Bone

Insertion:
- Medial angle of Mandible

Question 4

Lateral Pterygoid (Upper Head) Origin and Insertion

Answer 4

Origin:
Roof of Infratemporal Fossa

Insertion:
TMJ Disc

Question 5

Lateral Pterygoid (Lower Head) Origin and Insertion

Answer 5

Origin:
Lateral Surface of the Lateral Pterygoid Plate

Insertion:
Fovea of the Mandible

Question 6

Innervation and Action of the Masseter

Answer 6

Innervation:
CN V3 - Massenteric n.

Action:
Elevate Mandible

Question 7

Innervation and Action of Temporalis

Answer 7

Innervation:
CN V3 - Deep Temporal nn.

Action:
Elevate and Retract Mandible

Question 8

Innervation and Action of Medial Pterygoid (both heads)

Answer 8

Innervation:
N. to Medial Pterygoid from CN V3

Action:
Elevate and Laterally Move the Mandible

Question 9

Innervation and Action of Lateral Pterygoid

Answer 9

Innervation:
- N. to the Lateral Pterygoid from CN V3

Action:
- Protrude and Laterally move the Mandible

Question 10

Which of the muscles of mastication is involved in retracting the mandible?

Answer 10

Temporalis

Question 11

Which muscles of the mastication allow for lateral movement of the mandible?

Answer 11

Medial Pterygoid and Lateral Pterygoid

Question 12

is the only muscle of mastication NOT involved in raising the mandible?

Answer 12

Lateral Pterygoid

Question 13

Which muscles of the mandible have opposite actions?

Answer 13

Temporalis - Retraction

Lateral Pterygoid - Protrude mandible