Facial muscles

Question 1

Occipitofrontalis:
a) Attachments
b) Action

Answer 1

a) Frontal belly = skin/subcutaneuos tissue of eyebrows and forehead
Occipital belly = Occipital bone
b) Wrinkle forehead and elevate eyebrows

Question 2

Corrugator Supercilia:
a) Attachments
b) Action

Answer 2

a) Superciliary arch
b) draws eyebrows medially (vertical wrinkles = concern/worry)

Question 3

Procerus:
a) Attachments
b) Action

Answer 3

a) from between the eyebrows to the lateral nasal cartilages
b) Depress medial eyebrows (horizontal wrinkles = distain/dislike)

Question 4

Orbicularis Oculi:
a) Attachments
b) Action

Answer 4

a) From medial eye and lacramal bone to skin around the margin of the orbit (forms sphincter around eye
b) Palpebral = close eye gently (blink reflex)
Tightly = close eyes tightly (voluntary)

Question 5

Nasalis
a) Attachments
b) Action

Answer 5

Nasalis has 2 parts:
- Transverse part
a) From maxilla lateral to nose to the aponeurosis across the bridge of the nose
b) Crinkles the nose

-Alar part
a) From maxilla to the alar cartilage of nasal skeleton
b) flares nostrils

Question 6

Orbicularis Orris:
a) Attachments
b) Action

Answer 6

a) From medial mandible and maxilla to the mucous membrane of lips
b) Close/protrude lips

Question 7

What are the names and origins and insertion of the mouth dilators?

Answer 7

All insert into angle of the mouth

Zygomatic Major
- Zygomatic bone

Levator anguli oris
- Infraorbital Maxilla

Risorius
- Parotid fascia and buccal skin

Depressor anguli oris
- Base of mandible

Question 8

Buccinator:
a) Attachments
b) Action

Answer 8

a) From alveola process on maxilla/mandible to angle of mouth
b) Press cheeks to molar teeth (smiling) and resist distension

Question 9

Mentalis
a) Attachments
b) Action

Answer 9

a) body of manidble to skin of cheek
b)elevates and protrudes lower lips (sad)

Question 10

Platysma
a) Attachments
b) Action

Answer 10

a) Subcutaneous tissue of infra and supra clavicular region to angle of mouth, mandible, orbicularis oris, lower lip, skin of cheek

b) tenses skin of inferior face/neck and depresses mandible

Question 11

What branches of the facial nerve innervate the motor control of the face?

Answer 11

-Temporal branch
-Zygomatic branch
- Buccal branch
- Marginal mandibular branch
- Cervical branch
- Posterior auricular branch (innervates the occipital belly of occipitofrontalis)

Question 12

What muscles do the temporal branch nerve innervate?

Answer 12

Frontal belly of occipitofrontalis

Orbicularis Oculi

Question 13

What muscles do the zygomatic branch nerve innervate?

Answer 13

Orbicularis oculi

Levator labii superioris

Levaotr anguli oris

Zygomaticus major/minor

Question 14

What muscles do the Buccal branch nerve innervate?

Answer 14

Buccinator

Nasalis

orbicularis oris

Question 15

What muscles do the Marginal mandibular branch nerve innervate?

Answer 15

orbicularis oris

Depressor Labii inferioris

Depressor anguli oris

Question 16

What muscles do the Cervical branch nerve innervate?

Answer 16

Platysma

Question 17

What muscles do the Posterior auricular branch branch nerve innervate?

Answer 17

Occipital belly of occipitofrontalis

Question 18

What is bells palsy and what are its clinical features?

Answer 18

Definition = Paralysis of some/all of muscles of facial expression

If eye muscles are effects:
- Eversion of eyyelid
- tears not spreading over eye
- risk of corneal ulceration

If mouth muscles are effected:
- Food accumulation in mouth
- Dropping mouth
- speech affected