Muscles Of Mastication

Question 1

What is the origin of a muscle

Answer 1

Where the bone is remained immobile for the action

Question 2

What is the insertion of a muscle

Answer 2

The place where the bone moves during the action

Question 3

What is the origin of the temporalis

Answer 3

Temporal fossa

Question 4

What is the insertion of the temporalis

Answer 4

Coronoid process of the mandible

Question 5

What is the action of the temporalis

Answer 5

Elevate mandible

Question 6

What are the 4 muscles of mastication

Answer 6

Temporalis
Masseter
Lateral pterygoid
Medial pterygoid

Question 7

What is the origin of the masseter

Answer 7

Zygomatic arch

Question 8

What is the insertion of the masseter

Answer 8

ramus of mandible

Question 9

What is the action of the masseter

Answer 9

Elevate mandible

Question 10

What is the origin of the lateral pterygoid

Answer 10

Sphenoid and pterygoid plate

Question 11

What is the insertion of the lateral pterygoid

Answer 11

Superior head TMJ
Inferior head Pterygoid fovea on neck of condyloid process of mandible

Question 12

What is the action of the lateral pterygoid

Answer 12

Depress chin
Side to side motion of jaw

Question 13

What is the origin of the medial pterygoid

Answer 13

Pterygoid plate of sphenoid and tuberosity of maxilla

Question 14

what is the insertion of the medial pterygoid

Answer 14

Medial surface of the ramus and angle of mandible

Question 15

What is the action of the medial pterygoid

Answer 15

Grinding motion

Question 16

What is the innervation of the muscles of mastication

Answer 16

By a branch of the trigeminal nerve CN V3 (the mandibular nerve)

Question 17

where does the superficial part of the masseter originate from

Answer 17

The maxillary process of the zygomatic bone

Question 18

Where does the deep part of the masseter originate from

Answer 18

The zygomatic arch of the temporal bone

Question 19

Where does the superficial head of the medial pterygoid originate from

Answer 19

The maxillary tuberosity and the pyramidal process of palatine bone

Question 20

Where does the deep part of the medial pterygoid originate from

Answer 20

The medial aspect of the lateral pterygoid plate of the sphenoid bone

Question 21

What is the action of the medial pterygoid

Answer 21

Elevates the mandible
Closing the mouth

Question 22

Where does the superior head of the lateral pterygoid originate from

Answer 22

The greater wing of the sphenoid

Question 23

Where does the inferior part of the lateral pterygoid originate from

Answer 23

The lateral pterygoid plate of the sphenoid

Question 24

What is the action of the lateral pterygoid

Answer 24

Protract the mandible pushing the jaw forward
Side to side movement of jaw

Question 25

Which part of the jaw allows for protrusion and retraction

Answer 25

The upper part of the joint of the mandible

Question 26

Which part of the jaw allows for elevation and depression

Answer 26

The lower part of the joint of the mandible

Question 27

Which 2 muscles assist in the depression of the jaw

Answer 27

Geniohyoid Mylohyoid

Question 28

What does the buccinator muscle do

Answer 28

Maintains the tightness of the cheeks and presses them against the molar teeth during chewing

Question 29

What is the motor innervation of the buccinator

Answer 29

The buccal branches of the facial nerve CN VII

Question 30

What are the 4 suprahyoid muscles

Answer 30

Stylohyoid muscle Digastric muscle Mylohyoid muscle Geniohyoid muscle

Question 31

What is the role of the suprahyoid muscles

Answer 31

Chewing, swallowing and speech

Question 32

What are the 4 infrahyoid muscles

Answer 32

Sternohyoid Sternothyroid Thyrohyoid Omohyoid

Question 33

What is the role of the infrahyoid muscles

Answer 33

Active role in swallowing and the movement of the larynx

Question 34

What does posselts envelope refer to

Answer 34

The range of motion of the mandible