ANP 1106 Lecture Notes - Lecture 11: Visual Acuity, Isomerization, Ganglion Cell

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1106
• Professor: Joanne Savory

Document Summary

70% of all sensory receptors are in the eye. It is a slightly irregular hollow sphere with anterior and posterior poles. The wall is composed of three tunics (layers): fibrous, vascular, and sensory. The internal cavity is filled with fluids called humors (aqueous anterior and vitrius posterior) The lens separates the internal cavity into anterior and posterior segments: a biconvex, transparent, flexible, avascular structure that allows precise focusing of light onto the retina. Is composed of epithelium and lens fibers: lens epithelium: anterior cells that differentiate into lens fibers, lens fibers: cells filled with the transparent protein crystallin. Sclera forms most of the outer structure of the eyeball. Choroid: absorbs light to prevent double images like a black curtains: reflection is prohibited in diurnal animals, nocturnal animals allow reflection to increase light sensitivity. Accessory structures include eyebrows, eyelids, conjunctiva, lacrimal apparatus, and extrinsic eye muscles.