Eyeball and Eyelid Muscles Flashcards
levator palpebrae superioris (origin)
lesser wing of sphenoid bone (anterior surface)
levator palpebrae superioris (insertion)
upper eyelid (skin and fascia)
levator palpebrae superioris (nerve)
oculomotor nerve (CN III)
levator palpebrae superioris (action)
elevates upper eyelid
superior rectus (origin)
tendinous ring on posterior wall of orbital cavity
superior rectus (insertion)
superior surface of eyeball just posterior to corneoscleral junction
superior rectus (nerve)
oculomotor nerve (CN III)
superior rectus (action)
raises cornea upwards and medially
inferior rectus (origin)
tendinous ring on posterior wall of orbital cavity
inferior rectus (insertion)
inferior surface of eyeball posterior to corneoscleral junction
inferior rectus (nerve)
oculomotor nerve (CN III)
inferior rectus (action)
depresses the cornea downwards and medially
medial rectus (origin)
tendinous ring on posterior wall of orbital cavity
medial rectus (insertion)
medial surface of eyeball just posterior to corneoscleral junction
medial rectus (nerve)
oculomotor nerve (CN III)
medial rectus (action)
rotates eyeball so that the cornea looks medially
lateral rectus (origin)
tendinous ring on posterior wall of orbital cavity
lateral rectus (insertion)
lateral surface of eyeball just posterior to corneoscleral junction
lateral rectus (nerve)
abducens nerve (CN VI)
lateral rectus (action)
rotates eyeball so that the cornea looks laterally
superior oblique (origin)
posterior wall of orbital cavity
superior oblique (insertion)
passes through a pulley and is attached to superior surface of eyeball beneath superior rectus
superior oblique (nerve)
trochlear nerve (CN IV)
superior oblique (action)
rotates eyeball so that the cornea looks downwards and laterally
