Muscles of Mastication & Buccolabial

Question 1

Origin of Masseter

Answer 1

Zygomatic arch
Zygomatic bone

Question 2

Insertion of Massester

Answer 2

Lateral surface of the ramus and angle of the mandible

Question 3

Action of Massester

Answer 3

Elevates mandible

Question 4

Origin of Lateral Pterygoid

Answer 4

Superior head: Greater wing of sphenoid bone
Inferior head: lateral surface of the lateral pterygoid plate

Question 5

Insertion of Lateral Pterygoid

Answer 5

Superior head: Capsule and articular disk of the TMJ
Inferior head: Neck of mandible

Question 6

Action of Lateral Pterygoid

Answer 6

Protract mandible
Opens mouth
Active in grinding actions of chewing

Question 7

Origin of Medial Pterygoid

Answer 7

Medial surface of the lateral pterygoid plate
Pyramidal process of the palatine bone
Tuberosity of the maxilla

Question 8

Insertion of Medial Pterygoid

Answer 8

Medial surface of the ramus and angle of the mandible

Question 9

Action of Medial Pterygoid

Answer 9

Elevates and protracts the mandible

Question 10

Origin of Temporalis

Answer 10

Temporal fossa and temporal fascia

Question 11

Insertion of Temporalis

Answer 11

Coronoid process of mandible &
Anterior surface of the ramus of the mandible

Question 12

Action of Temporalis

Answer 12

Elevates the mandible
Posterior fibers retract the mandible

Question 13

Origin of Buccinator

Answer 13

Pterygomandibular raphe
Mandible
Maxilla lateral to the molar teeth

Question 14

Insertion of Buccinator

Answer 14

Angle of mouth, & lateral portion of upper and lower lips

Question 15

Action of Buccinator

Answer 15

Pull the corner of the mouth laterally ; presses cheek against teeth

Question 16

Origin of Depressor Anguli Oris

Answer 16

Oblique line of the mandible

Question 17

Insertion of Depressor Anguli Oris

Answer 17

Angle of the mouth

Question 18

Action of Depressor Anguli Oris

Answer 18

Pulls corner of mouth downward

Question 19

Origin of Depressor Labii Inferioris

Answer 19

Anterior surface of mandible

Question 20

Insertion of Depressor Labii Inferioris

Answer 20

Skin of lower lip

Question 21

Action of Depressor Labii Inferioris

Answer 21

Depresses lower lip

Question 22

Origin of Levator Anguli Oris

Answer 22

Canine fossa of the maxilla

Question 23

Insertion of Levator Anguli Oris

Answer 23

Angle (corner) of mouth

Question 24

Action of Levator Anguli Oris

Answer 24

Elevates the angle of the mouth

Question 25

Origin of Levator Labii Superioris

Answer 25

Inferior margin of the orbit

Question 26

Insertion of Levator Labii Superioris

Answer 26

Skin of upper lip

Question 27

Action of Levator Labii Superioris

Answer 27

Elevates the upper lip

Question 28

Origin of Levator Labii Superioris Alaeque Nasi

Answer 28

Frontal process of maxilla

Question 29

Insertion of Levator Labii Superior Alaeque Nasi

Answer 29

Ala of the nose and skin of the upper lip

Question 30

Action of Levator Labii Superior Alaeque Nasi

Answer 30

Elevates the upper lip and flares the nostril

Question 31

Origin of Mentalis

Answer 31

Anterior surface of the mandible near the mental symphysis (midline)

Question 32

Insertion of Mentalis

Answer 32

Skin of the chin

Question 33

Action of Mentalis

Answer 33

Elevates the lower lip and skin of chin

Question 34

Origin of Orbicularis Oris

Answer 34

Skin and fascia of lips and the area surrounding the lips

Question 35

Insertion of Orbicularis Oris

Answer 35

Skin and fascia of the lips

Question 36

Action of Orbicularis Oris

Answer 36

Purses the lips

Question 37

Origin of Risorius

Answer 37

Fascia of the lateral cheek

Question 38

Insertion of Risorius

Answer 38

Skin of the angle (corner) of the mouth

Question 39

Action of Risorius

Answer 39

Draws the corner of the mouth lateraly

Question 40

Origin of Zygomaticus Major

Answer 40

Upper lateral surface of the zygomatic bone

Question 41

Insertion of Zygomaticus Major

Answer 41

Skin of the angle of the mouth

Question 42

Action of Zygomaticus Major

Answer 42

Elevates and draws the corner of the mouth laterally

Question 43

Origin of Zygomaticus Minor

Answer 43

Lower surface of zygomatic bone

Question 44

Insertion of Zygomaticus Minor

Answer 44

Lateral part of upper lip

Question 45

Action of Zygomaticus Minor

Answer 45

Elevates upper lip