The Eye, parts, and functions
About this set
Created by:
malisa111 on August 3, 2011
Subjects:
Description:
Essentials of A&P; Scanlon and Sanders;
Classes:
NEW LONDON IA FCS, Hospital Coders of the future
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20 terms
Terms | Definitions |
|---|---|
 Cornea | *transparent, no capillaries, *covers the iris and pupil *refracts or bends light rays |
| Lens | *transparent elastic protein, no capillaries *shape is changed by the ciliary muscle *focus light from objects at varying distances |
| Iris | *colored part of the eye *located in front of the lens *two sets of smooth muscle *Regulates the size of the light opening (pupil) |
| Pupil | *opening in the center of the iris *Allows light to enter the eye |
| Retina | *lines the posterior (back) two-thirds eyeball *contains visual receptors; rods and cones |
| Fovea (fovea in macula lutea) | *contains only cones *small depression in the macuala *area for best color vision |
| Aqueous Humor (anterior cavity) | *tissue fluid of the eye *Within the anterior cavity of the eyeball *nourshes the lens of the cornea |
| Vitreous Humor (posterior cavity) | *semisolid substance *keeps the retina in place *development and helps maintain intraocular pressure (the pressure inside the eyeball). |
| suspensory ligaments | *strands of connective tissue * connect the ciliary body to the lens of the eye * hold the lens in place |
| ciliary body (muscles) | *circular muscle that surrounds the edge of the lend * connected to the lens by suspensory ligaments *changes the shape of the lens |
| choroid layer | *middle layer of tissue *contains blood vessels that nourish the retina *absorbs light within the eyeball *prevents glare |
| optic nerve | *cranial nerve part two (CN II) *the nerve that carries neural impulses from the eye to the brain |
| optic disc | *the point where the optic nerve enters the retina. (blind spot) *No rods or cones are present |
| sclera | *thickest layer of the eyeball *makes up the white of the eye |
| Corneal epithelium | 2layers stratified squamous epithelium on outside with deep simple squamous epithelial tissue |
| Anterior cavity | * found between the back of the cornea and the front of the lens *containa aqueous humor (tissue fluid of the eyeball) |
| Canal of Schlemm | *small veins at the junction of the iris and cornea. * the site of reabsorption of aqueous humor into the blood. |
| Conjunctiva | *membranes that line the eyelids *covers the white of the eye |
| Retinal artery and vein | enter eyeball at optic disk, supply upper and lower portion of the inner 2/3 of the retina not supplied by choroid |
| Inferior rectus muscle | the ocular muscle whose contraction turns the eyeball down and medially |
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