Answer
Characteristics of muscles that move the eyelids
Names : obicularis oculi; levator palpebrae superioris; corrugator supercilii
Obicularis ocule
Location: In eye. This is the sphincter of the eyelid that encircles the eye.
Action: closes eye in blinking, squinting and in sleep, ; spreads tear across eye
Origin: Lacrimal bone and adjacent regions of the temporal bone and maxilla , also medial angle of
the eyelid
Insertion: Upper and lower eyelids, and skin around orbital margin
Innervation : Facial nerve ( CN VII).
Work Step by Step
Muscle : Levator palpebrae superioris
Location; Deep to obicularis oris in eyelid and orbit
Action: Opens eye--elevates upper eyelid.
Origin: Lesser wing of the sphenoid bone in the posterior wing of the orbit.
Insertion: upper eyelid
Innervation: CN VII
Muscle . Corrugator supercilii
Location: in skin of eyebrow between frontalis and obicularis oculi
Origin: medial end of supraorbital ridge
Insertion: skin of eye and medial forehead
Innervation. Facial nerve ( temporal branch
