parts of the eye and their functions

21 terms by madkribur 

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A&P 2 Lab Test 1

conjunctiva

thin transparent mucous membrane; folded back upon itself; covers only the white of the eye; keeps eye from dryng out

cornea

transparent bulge in the front of the eye, curved, begins refraction;

iris

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;

anterior chamber

just behind the cornea, full of aqueous humor;

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;

pupil

space or black hole through which the light passes; can be eliptical in nature;

lens

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;

suspensory ligaments

attached to the lens; it, along with the ciliary body will cause accomodation (adjustments the eye makes for near and far vision)

ciliary body

second ring of tissue from pupil , accommodation and forms aqueous humor, smooth muscle;

posterior chamber

full of vitreous humor

vitreous humor

jelly-like; made only once; maintenance of intraocular pressure which will keep the eyeball from collapsing;

sclera

the outside part of the eye wall; very tough, white, extrinsic eye muscles attach to it;

choroid layer

second part of the eye wall; brown or black pigmented to prevent reflection by absorbing stray light rays;

retina

third part of the eye wall; contains rods and cones; photoreceptor cells; light rays are focused on it;

optic disk

blind spot; area where the retina leaves the eye and becomes the optic nerve; no rods or cones here, thus the blind spot;

optic nerve

cranial nerve II (2); carries the nerve impulse to the thalamus and then to the occipital lobe of the cerebrum, where vision is located;

macula lutea

part of the retina; yellow disk which is lateral to the blind spot;

fovea centralis

part of the retina; found in the center of the macula lutea; a place for daytime, color and distinct vision; contains only cones;

fibrous tunic

cornea and the sclera make up which tunic?

vascular tunic

pupil, iris, choroid and ciliary body make up which tunic?

sensory tunic (retina)

fovea centralis, optic disk, macula lutea

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