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parts of the eye and their functions
A&P 2 Lab Test 1
thin transparent mucous membrane; folded back upon itself; covers only the white of the eye; keeps eye from dryng out
transparent bulge in the front of the eye, curved, begins refraction;
colored portion of the eye; smooth muscle; causes dialation and constriction of the pupil; by doing so it regulates the amount of light entering the pupil, first ring of tissue from pupil;
just behind the cornea, full of aqueous humor;
clear, watery fluid, made by ciliary body; keeps cornea bulged out in front as well as maintenance of intra ocular pressure; made and contiually absorbed;
space or black hole through which the light passes; can be eliptical in nature;
transparent and elastic, continues refraction and focusing onto the retina; held in place by the suspensory ligaments which are operated by the ciliary body; has a convex shape;
attached to the lens; it, along with the ciliary body will cause accomodation (adjustments the eye makes for near and far vision)
second ring of tissue from pupil , accommodation and forms aqueous humor, smooth muscle;
full of vitreous humor
jelly-like; made only once; maintenance of intraocular pressure which will keep the eyeball from collapsing;
the outside part of the eye wall; very tough, white, extrinsic eye muscles attach to it;
second part of the eye wall; brown or black pigmented to prevent reflection by absorbing stray light rays;
third part of the eye wall; contains rods and cones; photoreceptor cells; light rays are focused on it;
blind spot; area where the retina leaves the eye and becomes the optic nerve; no rods or cones here, thus the blind spot;
cranial nerve II (2); carries the nerve impulse to the thalamus and then to the occipital lobe of the cerebrum, where vision is located;
part of the retina; yellow disk which is lateral to the blind spot;
part of the retina; found in the center of the macula lutea; a place for daytime, color and distinct vision; contains only cones;
cornea and the sclera make up which tunic?
pupil, iris, choroid and ciliary body make up which tunic?
sensory tunic (retina)
fovea centralis, optic disk, macula lutea