BIOL 2005 Lecture Notes - Emmetropia, Macula Of Retina, Superior Oblique Muscle
30 Jan 2013
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Document Summary
Walls of orbit: pyramidal shaped, twice as deep as wide. Inserts on tarsus superior (dense fibrous band) and goes deep and b/w orbicularis oculi assisted by superior tarsal muscle (sympathetic trunk: obicularis oculi. Mild version: sympathetics to upper eyelid affected: bell"s palsy (cn vii) 3 surfaces where refraction occurs: cornea: air/cornea interface cornea: curvature is constant (therefore index is constant) can use laser surgery to shave off cornea to change curvature to change refractive index. Iris: pupil contracts (sphincter pupillae) to limit light entrance to central of lens, increases depth of field for near objects, contraction: parasympathetic (cn iii, dilation: sympathetics. Increase power of cornea: strabismus, irregular curvature of lens or cornea poor focus, non-parallel visual axes. Muscles of eye (6: recti muscles: straight muscles, superior rectus: oculomotor nerve, when eye looking straight (don"t need to know for exam) Adduction, elevation, medial rotation (intorsion: when muscular axis and visual axis the same (abduct 23 degrees) elevation.
