MUSCLES OF THE ORBIT Flashcards
what are the muscles of the orbit?
- superior oblique (SO)
- inferior oblique (IO)
- superior rectus (SR)
- inferior rectus (IR)
- medial rectus (MR)
- lateral rectus (LR)
what cranial nerves innervate the muscles of the orbit?
- oculomotor (CN III)
- trochlear (CN IV)
- abducent (CN VI)
what muscles abduct the eye?
- superior oblique
- inferior oblique
- lateral rectus
what muscles adduct the eye?
- superior rectus
- inferior rectus
- medial rectus
what is the origin and insertion superior oblique?
origin: body of sphenoid
insertion: sclera deep to SR
what is the innervation of superior oblique?
trochlear nerve (CN IV)
what is the origin and insertion of inferior oblique?
origin: anterior floor of orbit
insertion: sclera deep to LR
what is the innervation of inferior oblique?
oculomotor nerve (CN III)
what is the origin and insertion of superior rectus?
origin: common tendinous ring
insertion: sclera posterior to corneoscleral junction
what is the innervation of superior rectus?
oculomotor nerve (CN III)
what is the origin and insertion of inferior rectus?
origin: common tendinous ring
insertion: sclera posterior to corneoscleral junction
what is the innervation of inferior rectus?
oculomotor nerve (CN III)
what is the origin and insertion of medial rectus?
origin: common tendinous ring
insertion: sclera posterior to corneoscleral junction
what is the innervation of medial rectus?
oculomotor nerve (CN III)
what is the origin and insertion of lateral rectus?
origin: common tendinous ring
insertion: sclera posterior to corneoscleral junction
what is the innervation of lateral rectus?
abducent nerve (CN VI)
what are the movements of the eyeball?
- elevation
- depression
- adduction
- abduction
