Muscles of Mastication

Question 1

What are the four Muscles of Mastication?

Answer 1

1. ) Temporalis
2. ) Massater
3. ) Lateral Pterygoid
4. ) Medial Pterygoid

Question 2

O of Temporalis

Answer 2

1. ) Floor of Temporal Fossa

2. ) Deep Surface of Temporal Fascia

Question 3

I of Temporalis

Answer 3

1. ) Anterior surface of Ramus of Mandible

2. ) Coronoid process of Mandible

Question 4

Action of Temporalis

Answer 4

1. ) Elevates Mandible; closing jaw

2. ) Posterior fibers retrude a protruded jaw

Question 5

Innervation of Temporalis

Answer 5

Deep Temporal braces of mandibular nerve

—Cranial Nerve V3

Question 6

O of Massater

Answer 6

1.) Inferior medial border of zygomatic arch

Question 7

I of Massater

Answer 7

Lateral surface of the ramus of mandible & it’s coronoid process

Question 8

Action of Massater

Answer 8

1. ) Elevates Mandible; closing jaw
2. ) Protrudes mandible
   - —deep fibers retrude

Question 9

Innervation of Massater

Answer 9

Massenteric Nerve

—Branches of mandibular nerve CN V3

Question 10

O of Lateral Pterygoid

Answer 10

Superior Head:
1.) Infratemperal surface & Infratemporal crest of greater wing of scaphoid
Inferior Head:
1.) Lateral surface of lateral pterygoid plate

Question 11

I of Lateral Pterygoid

Answer 11

1. ) Neck of Mandible

2. ) Articular disc & capsule of TMJ

Question 12

Action of Lateral Pterygoid

Answer 12

1.) Protudes mandible and drops jaw

ALONE- produces side to side movement

Question 13

Innervation of Lateral Pterygoid

Answer 13

Lateral Pterygoid Nerve

—Branch of Mandibular Nerve (V3)

Question 14

O of Medial Pterygoid

Answer 14

Deep Head
1.) Medial surface of Lateral Pteygoid Plate
2.) Pyramidal Process of palatine bone
Superficial Head
1.) Tuberosity of the maxilla

Question 15

I of Medial Pterygoid

Answer 15

Medial surface of ramus of mandible

Question 16

Action of Medial Pterygoid

Answer 16

1.) Helps Elevate mandible; closing the jaw
Bilaterally: helps protrude mandible
Alone: produces grinding

Question 17

Innervation of Medial Pterygoid

Answer 17

Medial Pterygoid Nerve

—branch of Mandibular Nerve (V3)

Question 18

Which muscles of mastication PROTRUDE the mandible

Answer 18

1. ) Massater
2. ) Medial Pterygoid
3. ) Lateral Pterygoid

Question 19

Which muscles of mastication RETRUDE the mandible

Answer 19

1. ) Temporalis

2. ) Deep fibers of Massater will retrude a protruded jaw

Question 20

Which muscles of mastication Elevate the mandible; closing the mouth

Answer 20

1. ) Temporalis
2. ) Massater
3. ) Medial Pterygoid