NSE 13A/B Lecture Notes - Lecture 10: Superior Rectus Muscle, Inferior Rectus Muscle, Medial Rectus Muscle
12 Sep 2016
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Nse 13 week 10 eyes and cranial nerves. Light refracted through transparent media (cornea, aqueous humor, lens, and vitreous body) and strikes the retina. Retina transforms light stimulus into nerve impulses that are conducted through optic nerve to the visual cortex of the occipital lobe. Image formed on retina is upside down and reversed (rt to lt) from its actual appearance. Strabismus (look crossed eyed) and diplopia (sees double) Diagnostic positions test (cn iii, iv, vi) Advance light again from the same side and look at response in opposite eye. Clear visual image maintained as the gaze is shifted from a distant to a near point. Thickening of the lens through contraction of the ciliary muscles. Shift gaze to near object i. e. finger held about 3 inches (7-8cm) from the nose. Normal response pupillary constriction and convergence of axes of the eyes. Pupils equal, round, react to light and accommodation.
