Muscles Of Mastication

Question 1

What are the main muscles of mastication?

Answer 1

Temporalis
Masseter
Lateral pterygoid
Medial pterygoid

Question 2

What are the supplementary muscles of mastication?

Answer 2

Digastric
Geniohyoid
Mylohyoid

Question 3

What is the nerve supply to the muscles of mastication?

Answer 3

Mandibular

Question 4

What is the function of this muscle?

Answer 4

Masseter

Elevation

Question 5

What nerve innervates the Masseter?

Answer 5

Masseteric nerve

Question 6

What is the blood supply to the Masseter?

Answer 6

The masseteric branch of maxillary artery

Question 7

What is this muscle?

Answer 7

Temporalis

Question 8

What are the actions of the Temporalis muscle?

Answer 8

Elevation of the mandible (closing the mouth). Also performs retraction of the mandible (moving the jaw posteriorly).

Question 9

What is the blood supply to the Temporalis muscle?

Answer 9

Deep temporal branches if the maxillary artery

Question 10

What are the 2 parts of the Temporalis?

Answer 10

Anterior

Posterior

Question 11

What direction do the anterior Temporalis fibres run?

Answer 11

Vertically

Question 12

What direction do the posterior Temporalis fibres run?

Answer 12

Almost horizontally

Question 13

What is the movements of the anterior posterior portion of the Temporalis?

Answer 13

Elevates mandible

Question 14

What is the movement of the posterior portion of the Temporalis?

Answer 14

Retraction

Question 15

What is the nerve supply to the Temporalis muscle?

Answer 15

Deep temporal branches of the mandibular nerve

Question 16

What muscles are shown?

Answer 16

Medial pterygoid

Question 17

What muscle is shown?

Answer 17

Lateral pterygoid

Question 18

What innervates the lateral pterygoid?

Answer 18

Lateral pterygoid nerves

Question 19

What blood vessel supplies the lateral pterygoid muscle?

Answer 19

Pterygoid branch of the maxillary artery

Question 20

What movements does the lateral pterygoid permit? (Bilateral pterygoids)

Answer 20

Protrusion of mandible
Assist in depression

Question 21

Once opened what are the main depressors of the mandible?

Answer 21

Digastric and geniohyoid muscles

Question 22

What are the 2 heads of the lateral pterygoid muscle?

Answer 22

Superior and inferior

Question 23

What muscle can cause unilateral movement of the mandible

Answer 23

Lateral pterygoid muscle

Question 24

If you contract your left lateral pterygoid muscle, what way are you swinging you mandible?

Answer 24

Move right

The condyle move medially

Question 25

What are the 2 parts of the medial pterygoid muscle?

Answer 25

Superficial and deep

Question 26

Where does the superficial pterygoid lie?

Answer 26

Behind the upper 8s

Question 27

Where do the pterygoid muscles attach on the sphenoid bone?

Answer 27

Lateral plate

Question 28

Where does the inferior pterygoid muscle originate on the sphenoid bone?

Answer 28

Lateral surface of lateral plate

Question 29

Where does the deep head of the pterygoid muscle originate?

Answer 29

The medial surface of the lateral plate

Question 30

What muscle insert on the medial surface of the angle of the mandible?

Answer 30

Both heads of medial pterygoid

Superior and inferior

Question 31

What is the movement of the medial pterygoid muscle? (Bilateral)

Answer 31

Elevation

Prehention (biting)

Assist the lateral pterygoids in the protrusion of the mandible

Question 32

What are the movements of the medial pterygoids muscle? (Bilaterally)

Answer 32

Trituration

(Grind food)