BIOL110 Lecture Notes - Oculomotor Nerve, Inferior Oblique Muscle, Conjunctivitis
30 Jan 2013
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Anatomy: walls of orbit, pyramidal shaped; twice as deep as wide, 45 degree angle between orbits; eyeball occupies only anterior half iii. lots of blood vessels and fat, shock absorber, cushion, lubricant, protects nerves/vessels. The eyeball: layers, fibrous outer coat, sclera: tough, dense fibrous coat that covers post. Parasympathetic innervation (contraction: goes thru ciliary ganglion, dependent on circular, concentric fibers. Vi: fibrous sheath contains mallable lens proteins => change shape when ciliary body contracts/ Extorsion(lateral rotation of eye)/intorsion(medial rotation of eye: superior rectus. 3: inferior rectus, muscle axis is ~23 degrees off from visual axis. 1: fxn: depression (abduction & extorsion, muscle axis is ~23 degrees off from visual axis, medial rectus: 1: fxn: abduction, superior oblique, inferior oblique: 1: fxns: intorsion (w/ depression & abduction, muscle axis is ~51 degrees off from visual axis. 1: fxns: extorsion (w/ elevation & abduction, muscle axis is ~51 degrees off from visual axis.
