facial expression A.U
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Transcript of facial expression A.U
Muscles of Facial expression
Their innervations
Major Arterial supply and venous drainage
Sensory innervation of the face….
The face is the mirror of the mind, and eyes without speaking confess the secrets of the heart.
St. Jerome
MUSCLES OF FACIAL EXPRESSION
Generally from skull to skin
Innervated by facial nerve
(CN VII)
Sphincters and dilators
around mouth (lips), eyes,
nostrils
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
MUSCLES AROUND THE EYE
Sphincter: Orbicularis oculi
(Orbital, palpebral and
lacrimal parts)
Blink (spread tears across
cornea) and close eyes tightly
Note: elevators of upper lid
innervated by CN III,
sympathetics
MUSCLES OF EYE
Orbicularis oculi
Sphincter muscle of eyelid
O: frontal & maxillary bones
and medial palpebral ligament
I: tissue of eyelid
Action: closes eye
Corrugator supercilii
small muscle that lay
under the larger frontalis
muscles
Action: draws eyebrow
Medially and inferiorly
Creating vertical lines
Demonstratig worry
Nasalis: This muscle spans
across the nasal bone and
connects to the maxilla.
When contracted this muscle
moves the nose with limited
movement. The nasalis will
draw together the skin of the
nose, useful in an expression
of disgust.
Action:elevates corners of
nostrils
MUSCLES OF FACIAL EXPRESSION
Zygomaticus
Orgin: zygomatic bone
Insertion: corners of mouth
Action: smiling
MUSCLES AROUND THE MOUTH
Numerous dilators
(levators/depressors of
upper/lower lip and angle of
mouth)
Buccinator
Sphincter: Orbicularis orisSurrounds/closes mouth
Buccinator
Orgin: Maxilla and
Mandible
Insertion: Angle of
the mouth
Action: Retracts
angle of mouth
MUSCLES OF FACIAL EXPRESSION
Common Facial Expressions
Smiling & Laughing: Zygomatics Major
Sadness: Levator Labii Superioris and LevatorAnguli Oris
Grief: Depressor Anguli Oris
Anger: LSAN and nasalis
Frowning: Corrugator Supercilii & Procerus
Horror, Terror & Fight: Platysma
Surprise: Frontalis
Doubt: Mentalis
Grinning: Risorius
Contempt: Zygomatic Minor
SMILING MUSCLES FROWNING MUSCLES
Levator Labii Superioris: raise upper lip
Levator Anguli Superioris: raise angle of mouth upward
Zygomaticus: draw angle of mouth upward
Risorius: draw angle of mouth laterally
Frontalis: elevate eyebrows
Depressor Anguli Oris:draw angle of mouth downward
Depressor Labii Inferioris:lowers lower lip
Mentalis: draws chin up
Platysma: draws lower lip down & back
FACIAL NERVE
It has both Efferent component and
Afferent component
Efferent (motor) component supplies all
the muscles of the
Afferent (sensory) component supplies the
Taste sensation of the Ant.2/3rd of the tongue
Course of facial nerve (CN VII)
Through the petrous part of the temporal
bone:
Through internal acoustic meatus with CN VIII
Exits skull via stylomastoid foramen, most
branches go through parotid gland
Temporal
Zygomatic
Buccal
Marginal mandibular
Cervical
Posterior auricular
MUSCLES & NERVE SUPPLY
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
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)