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Glossary of a & p unit 4
Created by randeeotte@hotmail.com
- Accomodation Reflex
- adjustment of thickness of the lens by the ciliary muscle (from the motor neuron of the reflex arc)
- Choroid Layer
- dark pigmint of the back side of the retina that absorbs light waves.
- Cones
- lesser of the neurons in the retina but concentrated in the macula, have a high threshold, and send impulses in color to the cerebrum.
- Convex
- images come in upside down and the brain reverses them
- Fovea Centralis
- The sweet spot - central portion of the macula containing only cones
- Hyperopia
- Far sighted - focal point is behind the retina, eye is too short of lens is too weak, need a convex lens
- Myopia
- Near sighted - Focal point is in front of the retina, need a concave lens - Eye is too long or the lens is too strong(thick).
- Optic Chiasm
- X crossing of the nerves behind the eyes
- Optic Disk
- Begining of the optic nerve and our blind spot
- Optic Nerve
- Nerve from the eye to the brain
- Presbyopia
- Age-related farsightedness, lens loses elasticity, needs a convex lens.
- Retina
- contains nerve cells that depolarize in the presence of light
- Rods
- most of nerve cells in the retina, have a low threshold (work in dim light), send images to the cerebrum not in color and lacking resolution.
- Sclera
- white part of the eye that is a though thick membrane
- Two types of nerve cells in the retina
- Rods and Cones
- Vireous Humor
- fluid located behind the lens
