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KMK_ Ocular Anatomy_ EOMs
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- NUR 240 EXAM 2 Practice Questions.
KMK_ Ocular Anatomy_ EOMs
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KMK: Ocular Anatomy: EOMsdifferences of EOMs from other muscle - ANS-denser blood and nerve supply;
movements are faster and more fatigue-resistant
inferior rectus (IR) - ANS-origin = *common tendinous ring* at infraoptic tubercle; inserts
6.5mm from limbus; sheath combines with IO sheath to form suspensory ligament of
Lockwood
lateral rectus (LR) - ANS-origin = CtR; inserts 6.9mm from limbus; lateral check
ligament anchors to Whitnall's tubercle (zygomatic bone)
medial orbital septum - ANS-bone behind the posterior lacrimal crest, the caruncle, and
the plica semilunaris
medial rectus (MR) - ANS-origin = CTR; inserts 5.5mm from limbus (closest of recti);
medial check ligament anchors to medial orbital septum
Spiral of Tillaux - ANS-formed by the recti muscle insertions on the globe
superior oblique (SO) - ANS-origin = lesser wing of sphenoid & CTR; loops through
trochlea then inserts on superior lateral globe behind equator
superior rectus (SR) - ANS-originates from *common tendinous ring* anterior to superior
orbital fissure (SOF); inserts 7.7mm from limbus; sheath connected to sheath of levator
and connective tissue of sup. conj fornix, ensures lid is raised when eye in upgaze; of
recti, inserts furthest from limbus
suspensory ligament of Lockwood - ANS-IR sheath + IO sheath; attaches to inf tarsal
plate, extends from zygomatic bone of lateral wall to lacrimal bone of the medial wall;
provides support for globe
trochlea - ANS-physiologic origin of the SO; changes its direction of action
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