lecture 32 (pt 2) & 33 eye and ear muscle facts

roof of orbit

levator palpebrae superioris m origin

skin of upper eyelid

levator palpebrae superioris m insertion

elevates upper eyelid

levator palpebrae superioris m function

CN III (lps)

levator palpebrae superioris m innervation

common tendinous ring (annulus of zinn)

superior rectus m origin

sclera of eyeball (sr)

superior rectus m insertion

elevation and intortion

superior rectus m function

CN III (sr)

superior rectus m innervation

common tendinous ring (annulus of zinn)

inferior rectus m origin

sclera of eyeball

inferior rectus m insertion

depression and extortion

inferior rectus m function

CN III (ir)

inferior rectus m innervation

Common tendinous ring (Annulus of Zinn)

medial rectus m origin

sclera of eyeball (mr)

medial rectus m insertion

adduction

medial rectus m function

CN III (mr)

medial rectus m innervation

Common tendinous ring (Annulus of Zinn) (lr)

lateral rectus m origin

sclera of eyeball (lr)

lateral rectus m insertion

abduction

lateral rectus m function

CN VI

lateral rectus m innervation

anteromedial floor of orbit, maxilla

inferior oblique m origin

sclera of eyeball (io)

inferior oblique m insertion

elevation and extortion

inferior oblique m function

CN III (io)

inferior oblique m innervation

body of sphenoid, passes through trochlea

superior oblique m origin

sclera of eyeball (so)

superior oblique m insertion

depression and intortion

superior oblique m function

CN IV

superior oblique m innervation

on top of ring

where does the superior oblique m lie in relation to the common tendinous ring?

pyramidal eminence

stapedius m origin

neck of stapes

stapedius m insertion

tension the head of stapes posteriorly to dampen the movement of the ossicles (protection from loud sounds)

stapedius m function

facial n (CN VII)

stapedius m innervation

auditory tube

tensor tympani m origin

handle of malleus

tensor tympani m insertion

pulls TM inward to dampen loud noises by increasing tension on the TM

tensor tympani m function

mandibular division of trigeminal nerve

tensor tympani m innervation