Muscles Of Orbit Flashcards
Insertion of levator palpebrae superioris
Superior tarsus and skin of superior eyelid
Origin of levator palpebrae superioris
Lesser wing of sphenoid bone, superior and anterior to optic canal
Innervation of levator palpebrae superioris
Oculomotor nerve Deep layer (superior tarsal muscle) supplied by sympathetic fibers
Actions of the levator palpebrae superioris
Elevates superior eyelid
Origin of the superior oblique (SO)
Body of sphenoid bone
Insertion of superior oblique (SO)
Tendon passes through trochlea to insert into sclera, deep to SR
Innervation of the superior oblique (SO)
Trochlear nerve (CN IV)
Action of the superior oblique (SO)
Abducts, depresses, and rotates eyeball medially (intorsion)
Origin of the inferior oblique (IO)
Anterior part of floor of orbit
Insertion of the inferior oblique (IO)
Sclera deep to lateral rectus muscle
Innervation of inferior oblique (IO)
Oculomotor nerve (CN III)
Action of the inferior oblique (IO)
Abducts, elevates, and rotates eyeball laterally (extorsion)
Origin of the superior rectus (SR)
Common tendinous ring
Insertion of the superior rectus (SR)
Sclera just posterior to corneoscleral junction
Innervation of the superior rectus (SR)
Oculomotor nerve (CN III)
Action of the superior rectus (SR)
Elevates, adducts, and rotates eyeball medially (intorsion)
Origin of the inferior rectus (IR)
Common tendinous ring
Insertion of inferior rectus (IR)
Sclera just posterior to corneoscleral junction
Innervation of the inferior rectus (IR)
Oculomotor nerve (CN III)
Actions of the inferior rectus (IR)
Depresses, adducts, and rotates eyeball laterally (extorsion)
Origin of the medial rectus (MR)
Common tendinous ring
Insertion of the medial rectus (MR)
Sclera just posterior to corneoscleral junction
Innervation of the medial rectus (MR)
Oculomotor nerve (CN III)
Action of the medial rectus (MR)
Adducts eyeball
