HEAD MUSCLES

Question 1

Frontal Belly of the Occipitofrontalis

Answer 1

Draws scalp anteriorly, raises eyebrows. wrinkles forehead

Question 2

Occipital Belly of the Occipitofrontalis

Answer 2

Draws scalp posteriorly

Question 3

Orbicularis Oris

Answer 3

Closes + purses lips, compresses lips against teeth, shapes lips during speech

Question 4

Zygomaticus Major

Answer 4

Draws angle of mouth superiorly + laterally (i.e. smiling)

Question 5

Zygomaticus Minor

Answer 5

Raises (elevates) upper lip → exposes maxillary (upper) teeth

Question 6

Levator Labii Superioris

Answer 6

Raises upper lip

Question 7

Depressor Labii Inferioris

Answer 7

Depresses lower lip

Question 8

Depressor Anguli Oris

Answer 8

Draws angle of mouth laterally + inferiorly (i.e. opening mouth)

Question 9

Levator Anguli Oris

Answer 9

Draws angle of mouth lateral + superiorly

Question 10

Buccinator

Answer 10

• Presses cheeks against teeth + lips (whistling, blowing, sucking)
• Draws corner of mouth laterally
• Assists in mastication (chewing) by keeping food b/w the teeth

Question 11

Risorius

Answer 11

Draws angle of mouth laterally (grimacing)

Question 12

Mentalis

Answer 12

Elevates + protrudes lower lip and pulls skin of chin up (pouting)

Question 13

Platysma

Answer 13

• Draws outer part of lower lip inferiorly + posteriorly (i.e. pouting)
• Depresses mandible

Question 14

Orbicularis oculi

Answer 14

Closes eye

Question 15

Corrugator supercilii

Answer 15

Draws eyebrow inferiorly + wrinkles skin of forehead vertically (i.e. frowning)

Question 16

What muscles are the fastest and most precisely controlled?

Answer 16

Extrinsic eye muscles

Question 17

How many Extrinsic Eye muscles are there?

Answer 17

7 Extrinsic Eye Muscles

• 1 Levator Palpebrae Superioris (LPS)
• 4 Straight (recti) muscles
• 2 Oblique muscles

Question 18

Which muscles DO NOT originate from the common tendinous ring?

Answer 18

1. Levator Palpebrai Superioris

2. Inferior oblique muscle

Question 19

Superior Rectus

Answer 19

• Moves eyeball superiorly (elev) + medially (addu)

- Rotates medially

Question 20

Inferior Rectus

Answer 20

• Moves eyeball inferiorly (depr) + medially (addu)

- Rotates them laterally

Question 21

Lateral Rectus

Answer 21

Moves eyeballs laterally (abdu)

Question 22

Medial Rectus

Answer 22

Moves eyeballs medially (addu)

Question 23

Superior Oblique

Answer 23

• Moves eyeballs inferiorly (depr) + laterally (abdu)

- Rotates them medially

Question 24

Inferior Oblique

Answer 24

• Moves eyeball superiorly (elev) + laterally (abdu)

- Rotates them laterally

Question 25

Levator Palpebrae Superioris

Answer 25

Elevates upper eyelids (i.e. opens eyes)

Question 26

Most Extrinsic muscles of the eye are innervated by…?

Answer 26

Oculomotor nerve (CN III)

Question 27

What 2 extrinsic muscles of the eye are NOT innervated by CN III?

Answer 27

1. Superior Oblique

2. Lateral Rectus

Question 28

What innervates Superior Oblique muscle?

Answer 28

Trochlear nerve (CN IV)

Question 29

What innervates Lateral Rectus?

Answer 29

Abducens nerve (CN VI)

Question 30

Muscles of Mandible

Answer 30

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

Question 31

Strongest mandible muscles (also elev mandible)

Answer 31

1. Masseter
2. Temporalis
3. pterygoid

Question 32

What is the function of lateral pterygoid?

Answer 32

Assists by moving mandible from side to side, grinding food

Question 33

What innervates muscles of mastication?

Answer 33

Trigeminal nerve (CN V)

Question 34

Masseter

Answer 34

Elev mandible (i.e. closing mouth)

Question 35

Temporalis

Answer 35

Elev + retracts mandible

Question 36

Medial pterygoid

Answer 36

• Elev + protracts (protrudes) mandible

- Moves mandible side to side

Question 37

Lateral pterygoid

Answer 37

• Protracts mandible
• Depresses mandible (i.e. opening mouth)
• Moves mandible side to side

Question 38

Types of Tongue Muscles

Answer 38

1. Extrinsic

2. Intrinsic