Muscles Of Facial Expression

Question 1

Origin, Attachment, nerve supply and actions of orbicularis Oris?

Answer 1

Origin = vermillion line

Attaches = submucosa of lips

Innervation - buccal and marginal mandibular branch of facial nerve

Actions = compress and protrude lips

Question 2

Attachment, nerve supply and actions of orbicularis oculi

Answer 2

Origin = nasal of frontal bone and palpebral ligament

Attachment = skin around margin of orbit

Nerve supply = temporal and zygomatic branches of facial nerve

Action =close eyelids gently or tightly

Question 3

Attachment, nerve supply and actions of buccinator

Answer 3

Origin - posterior of alveolar process and pterygomandibular raphe

Attachment - merge with orbicularis oris

Nerve supply = buccal branches of facial nerve

Action = press cheeks against molars

Question 4

Attachment, nerve supply and actions of platysma

Answer 4

Origin = subcutaneous tissue of subraclavicular and infraclavicular area

Insertion = base of mandible to merge with O-oris

Innervation = cervical of facial nerve

Actions = tense skin of inferior face and neck and depress mandible

Question 5

Attachment, nerve supply and actions of occipitofrontalis

Answer 5

Origin of occipital belly = superior nuchal line
Origin of frontal belly = epicranial aponeuroris

Insertion of occipital belly = epicranial aponeuorsis
Insertion of frontal belly = skin/subcutaneous tissue of eyebrows and forehead

Actions = retract scalp, wrinkle forehead and elevate eyebrows

Question 6

Function and brief form of the dilator muscles of the mouth?

Answer 6

Function to widen the mouth

Form like the spokes of a bicycle wheel, they surround the mouth and radiate from the lips and corners of the mouth.

Sets of Levator and depressor muscles.

Question 7

Give brief form and function of the dilator muscles of the nose

Answer 7

Act to wrinkle skin over dorsum of nose or to flare nostrils

Typically run from the maxilla below or from the frontal process of maxilla above

Question 8

Describe the form and dilator muscles of the auricle briefly

Answer 8

Superior, posterior and anterior auricular muscles

All innervate by facial nerve

Supplied by external carotid artery

Question 9

What’s arteries supply the face

Answer 9

Internal carotid artery
- zygomaticofacial
-zygomaticotemporal
- supraorbital
- supratrochlear

External carotid artery
- facial
- buccal, mental,m infraorbital (branches of maxillary artery)
- transverse facial (branch of superficial temporal)

Question 10

What veins drain the face

Answer 10

Mainly the facial vein and the transverse facial vein to the interior jugular vein

Question 11

What are the layers of the eyelid?

Answer 11

Skin
CT
Conjunctiva
Muscle (orbicularis oculi)
Tarsus (eyelid support)
Orbital septum