Muscles of facial expression

MUSCLES OF FACIAL EXPRESSION


MUSCLES OF FACIAL EXPRESSION

FACIAL MUSCLES

  • The facial muscles are a group of striated skeletal muscles innervated by the facial nerve (cranial nerve VII)  which control facial expression.
  • These muscles are also called mimetic muscles.
  • Develop from mesoderm.
  • The facial musculature is fairly unique.
  • They include the only somatic muscles in the body attached on one side to bone and the other to skin; thus facial movements are specialized for expression.
  • They also act as sphincters and dilators of the orifices of the face.
  • Facial muscles develop from second pharyngeal arch except levator palpebrae superioris.
  • The face is also one of the few places in the body where some muscles are not attached to any bone at all (e.g., orbicularis oculi, the muscle surrounding the eyes; orbicularis oris, the muscle in the lips).
MUSCLES OF FACIAL EXPRESSION
 
  • Muscles of facial expression are subcutaneous muscles & bring about different facial expressions.

These muscles are:

  1. Muscles of scalp: Occipitofrontalis
  2. Muscles of auricle (around ear): Auricularis anterior, superior & posterior.
  3. Muscles of eyelidsOrbicularis oculi, corrugator supercilli, levator palpebrae superioris.
  4. Muscles of nose: Procerus, compressor naris, dilator naris, depressor septi
  5. Muscles around mouth: Orbicularis oris, buccinator, levator labii superioris alaque nasi, zygomaticus major, levator labii superioris, levator anguli oris, depressor labii inferioris, mebtalis, risorius.
  6. Muscles of neck: Platysma
  • These muscles bring about different facial expressions:

MUSCLES OF FACIAL EXPRESSION

Smiling & laughing

Zygomaticus major

Sadness

Levator labii superioris & levator angularis

Grief

Depressor anguli oris

Anger

Dilator naris & depressor septi

Frowning

Corrugator supercilii & procerus

Horror, terror & fright

Platysma

Surprise

Frontalis

Doubt

Mentalis

Grinning

Risorius

Contempt

Zygomaticus minor

Closing the mouth

Orbicularis oris

Whistling

Buccinators & orbicularis oris

Winking (blinking)

Orbicularis oculi

FUNCTIONAL GROUP OF FACIAL MUSCLES
 
  • Functionally, most of these muscles may be regarded primarily as regulators of three openings situated on face:
  1. Paplpebral fissure (eye opening)
  2. Nostrils
  3. Oral fissure (mouth opening)

OPENING

SPHINCTER

DILATORS

PALPEBRAL FISSURE

Orbicularis oculi

  1. Levator palpebrae superioris
  2. Frontalis part of occipitofrontalis

ORAL FISSURE

Orbicularis oris

All the muscles around the mouth, except the orbiculsaris oris the sphincter, & the mentalis which does not mingle with orbicularis oris.

 

NOSTRILS

Compressor naris

  1. Dilator naris
  2. Depressor septi
  3. Medial slip of levator labii superioris alaque nasi

  NERVE INNERVATION OF FACIAL MUSCLES:

All Facial muscles are supplied by facial nerve except levator palpaberal superioris which is supplied by occulomotor nerve by following branches :
 
  1. Temporal branch –  Innervates the frontalis, orbicularis oculi and corrugator supercilii
  2. Zygomatic branch – Innervates the orbicularis oculi.
  3. Buccal branch – Innervates the orbicularis oris, buccinator and zygomaticus muscles.
  4. Marginal Mandibular branch – Innervates the mentalis muscle.
  5. Cervical branch – Innervates the platysma.
Exam Question
 
  • Facial muscles develops from mesoderm.
  • Facial muscles act as sphincter & dilator of orifice of face.
  • Facial muscle develops from 2nd pharyngeal arch except levator palpebrae superioris.
  • Lacrimal part of orbicularis oculi is k/as Horner’s muscle.
  • Levator Palpebrae superioris dilate palpebral aperture.
  • Facial muscles are supplied by Facial nerve.
  • Levator palpeberae superioris, only Facial muscle not supplied my facial nerve. 
Don’t Forget to Solve all the previous Year Question asked on MUSCLES OF FACIAL EXPRESSION

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