EOMs
which axis allows intorsion & extorsion? - ANS-sagittal
which EOMs originate from the CTR - ANS-LR
MR
SR
IR
which EOMs also originate from the dural sheath surrounding the optic nerve?
and what makes this clinically relevant? - ANS-SR & MR
optic neuritis= pain on movement
what is the anatomical region of the SO?
and what is its position relative to the optic canal? - ANS-lesser wing of sphenoid
superior & medial to optic canal
what is the fxnl origin of the SO? - ANS-pulley for SO tendon
only EOM that does NOT originate from orbital apex? - ANS-IO
where does the IO originate? - ANS-maxilla on orbital floor just post to the orbital margin
and lateral to the nasolacrimal canal opening
which EOM attaches furthest away from the limbus - ANS-SLIM
If a an EOM attaches closer to the limbus, is its pull on the eyeball weaker or stronger? -
ANS-stronger
where does the SO insert? - ANS-upper posterolateral quadrant
where does the IO insert? - ANS-lower posterolateral quadrant
which EOM attaches to sclera overlying the macula of the retina - ANS-IO
action of LR - ANS-abduction
action of MR - ANS-adduction
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