Muscles of Mastication

Question 1

What are the 4 muscles of mastication?

Answer 1

1. Temporalis
2. Masseter
3. Medial pterygoid
4. Lateral pterygoid

Question 2

What are the 4 movements of the jaw?

Answer 2

1. Protrusion
2. Retrusion
3. Elevation
4. Depression

Question 3

What is the origin of the masseter?

Answer 3

Zygomatic arch

Question 4

What is the insertion of the masseter?

Answer 4

Ramus and angle of mandible

Question 5

What is the nerve supply of the masseter?

Answer 5

Masseteric from ant. division of mandibular nerve

Question 6

What are the 2 actions of the masseter?

Answer 6

1. Elevation of mandible

2. Protrusion of mandible

Question 7

What are the 3 origins of the temporalis?

Answer 7

1. Temporal lines
2. Temporal fossa
3. Deep surface of temporal fascia

Question 8

What is the insertion of the temporalis?

Answer 8

Coronoid process

Question 9

What is the nerve supply of the temporalis?

Answer 9

Deep temporal nerve from ant. division of mandibular nerve

Question 10

What is the action of the ant. fibres of the temporalis?

Answer 10

Elevation of mandible

Question 11

What is the action of the post. fibres of the temporalis?

Answer 11

Retrusion of the mandible

Question 12

What is the origin of the upper head of the lateral pterygoid?

Answer 12

Infratemporal surface of greater wing of sphenoid

Question 13

What is the origin of the lower head of the lateral pterygoid?

Answer 13

Lateral surface of lateral pterygoid plate

Question 14

What is the insertion of the upper head of the lateral pterygoid?

Answer 14

Join capsule and intraarticular disc

Question 15

What is the insertion of the lower head of the lateral pterygoid?

Answer 15

Neck of the mandible (pterygoid fovea)

Question 16

What is the nerve supply of the lateral pterygoid?

Answer 16

Ant. division of mandibular nerve

Question 17

What is the bilateral action of the lateral pterygoid?

Answer 17

Depression of the mouth

Question 18

What is the unilateral action of the lateral pterygoid?

Answer 18

Side to side movement of mandible

Question 19

What is the origin of the superficial head of the medial pterygoid?

Answer 19

Maxillary tuberosity

Question 20

What is the origin of the deep head of the medial pterygoid?

Answer 20

Medial surface of lateral pterygoid plate

Question 21

What is the insertion of the medial pterygoid?

Answer 21

Deep surface of ramus and angle of mandible

Question 22

What is the nerve supply of the medial pterygoid?

Answer 22

Trunk of the mandibular nerve

Question 23

What is the bilateral action of the medial pterygoid?

Answer 23

Elevation of mandible

Question 24

What is the unilateral action of the medial pterygoid?

Answer 24

Side to side movement of mandible

Question 25

What muscles of mastication cause the mandible to protract?

Answer 25

1. Lateral pterygoid | 2. Masseter

Question 26

What muscles of mastication cause the mandible to retract?

Answer 26

1. Posterior fibres of temporalis

Question 27

What muscles of mastication cause the mandible to elevate?

Answer 27

1. Masseter 2. Medial pterygoid 3. Anterior fibres of temporalis

Question 28

What muscles of mastication cause the mandible to depress?

Answer 28

Lateral pterygoid