ANAT-A 210 - Muscles of Facial Expression

MUSCLES OF FACIAL EXPRESSION

Corrugator supercilii Procerus Frontalis Auricularis Orbicularis oculi Zygomaticus Compressor nares Risorius Major Minor F Orbicularis Buccinator Modiolus Oris B Anguli oris Depressors Labii inferioris Mentalis Platysma A = Incisive slip of orbicularis oris B = Mental slip of orbicularis oris C=Orbital part of orbicularis oculi (complete sphincter, screws up eye, decreases volume of conjunctiveal sac & tears spill over) D= Palpebral part of orbicularis oculi (Medial palpebral ligament to lateral palpebral raphe. Keeps volume of conjuctival sac constant, no tear spill, closes eye) E = Levator labii superioris F= Levator anguli oris G = Levator labii superioris alaeque nasi (Dilator nares & depressor septi are not shown) Note: The face has no deep fascia, variables amount of fat, good blood supply & drainage. Muscles are 2nd arch mesoderm, equivalent to the panniculus carnosus of animals, often attached to the dermis & are arranged into sphincters, dilators and expressors