Facial Muscles and Muscles of Mastication Flashcards
What do the facial muscles attach to in general?
Originate from bone or fascia Insert into skin Located in subcutaneous tissue
Which pharyngeal arch are the facial muscles derived from?
Second
What are the facial muscles innervated by?
Facial nerve
General movements of the orbital group?
Control movement of the eyelid and so protect the cornea from damage
Name the muscles of the orbital group
Orbicularis oculi
Corrugator supercillii
Movements of the orbiculares oculi?
Inner palpebral part closes the eye gently Outer orbital part does it more forcefully
Actions of the corrugator supercillii?
Draws eyebrows together
Where is the corrugator supercillii located in relation to the orbicularis oculi? Desribe it.
Smaller
Posterior to the OO
Inserts into the skin of the eyebrow
Damage to the facial nerve results in orbitals beings paralysed. What can this cause?
Eye cannot close, cornea dries out, exposure keratitis Lower lid droops - ‘ectropion’ - lacrimal fluid pools in lower lid and isn’t spread across surface of the eye. Failure to remove debris so get ulceration of the corneal surface
How to test for facial nerve palsy?
Raise eyebrows Close eyes
Name the facial muscles of the nasal group
Nasalis Procerus Depressor septi nasi
Talk about the nasalis
Largest of the nasal group Split in two parts - transverse and alar Transverse compresses nares, alar opens them
Action of the procerus?
Most superior
Pulls eyebrows down
Action of the depressor septi nasi?
Pulls nose inferiorly, opening nares
Function of the orbicularis orbis?
Purses lips