2. MUSCLES OF FACIAL EXPRESSION
Generally from skull to skin
Innervated by facial nerve
(CN VII)
Sphincters and dilators
around mouth (lips), eyes,
nostrils
6. Frontal Belly of Ocipito
frontalis:
Orgin : Galea
Aponeurotica
Insertion: Orbicularis
oculi and adjacent skin
Action: Draws scalp
forward and raises
eyebrows
MUSCLES OF FACIAL EXPRESSION
7. MUSCLES OF EYE
Orbicularis oculi
Sphincter muscle of eyelid
O: frontal & maxillary bones
I: tissue of eyelid
Action: closes eye
Nerve: facial / CN VII
8. MUSCLES AROUND THE NOSE
Procerus - wrinkles skin
of nose
Compressor nares –
lateral to bridge of nose
compresses nasal
cartilage.
Dilator nares - lateral to
nostrils – dilates
9. MUSCLES OF FACIAL EXPRESSION
Zygomaticus
Orgin: zygomatic bone
Insertion: corners of mouth
Action: smiling
Nerve: facial / CN VII
10. MUSCLES AROUND THE MOUTH
Numerous dilators
(levators/depressors of
upper/lower lip and angle of
mouth)
Buccinator
Sphincter: Orbicularis oris
Surrounds/closes mouth
11. Buccinator
Orgin: Maxilla and
Mandible
Insertion: Angle of
the mouth
Action: Retracts
angle of mouth
MUSCLES OF FACIAL EXPRESSION
27. Facial Muscles – Raising Chin
Mentalis:
Raises chin,
protrudes
lower lip,
and
Decreases
depth of
lower
vestibule.
28. Facial Muscles – Grimacing
Platysma:
Raises
skin of
neck and
lowers
corner of
mouth.
29.
30. CUTANEOUS INNERVATION OF FACE
Branches of trigeminal
nerve (CN V):
Ophthalmic (V1)
Maxillary (V2)
Mandibular (V3)
Cervical plexus branches
(C2)
Lesser occipital
Great auricular
Greater occipital nerve
(dorsal ramus of C2)
31.
32. MUSCLES & NERVE SUPPLY
motor nerve supply of facial muscles
are by branches of facial nerve
Orbicularis oculi Temporal and
zygomatic branches
Muscles of Upper Lip and Buccal Branch
Buccinator, Levator Anguli Oris
Risorius and Mandibular Branch
muscles of lower lip
Platysma Cervical Branch
33.
34. Damage to UMNs, LMNs, or facial nerve
Clinical testing: raise eyebrows, close eyes tightly, smile
Unilateral UMN: contralateral lower 1/2-2/3 of face
paralysed
Unilateral LMN or CN VII: entire ipsilateral face paralysed
(Bell’s palsy)
Lack of blinking
Leaky mouth
Speech difficulties
(other CN VII functions)
35. A lesion involving the nuclear or infranuclear
portion of the facial nerve will produce a
peripheral facial palsy.
If all motor components are involved, there is
complete paralysis of all facial muscles on the
involved side.
The brow is smooth
the eye does not close
the nasolabial fold is flat
side of the mouth droops
There is no movement at all
36. Idiopathic: Bell's palsy may strike at any
age, often after a mild viral illness.
Recovery is over a period of weeks to
months and is variable. The cause of the
idiopathic variety is unknown.