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Anatomy > Special Senses > Flashcards

Flashcards in Special Senses Deck (16):
1

ciliary body

anterior portion
smooth muscle, changes shape of the lens

2

iris

colored part of the eye, contracts and relaxes
continuous with the ciliary body

3

choroid

helps focus light and keep it from bouncing around
contains brown pigment
highly vascularized

4

retina

pigmented layer, epithelial cells, absorbs xs light
neural layer, contains the photoreceptors
bipolar cells and ganglion cells (these are neurons)

5

optic disc

where optic nerve exits the eyeball
no photoreceptors here
blind spot

6

macula lutae

oval region of the eye
contains mostly cones
important fro high visual acuity - a sharp image
in the center is a small pit

7

fovea centralis

only cones in the center of the macula lutea
as you move away from FC, fewer and fewer cones
only the size of a pinhead, why we constantly move our eyeballs to see

8

posterior segment

filled with vitreous humor, a watery gel, reacts to introcular pressure, keeps eyeball round and no collapsing
VH forms during embryo, what we have at birth stays with us for life

9

anterior segment

cornea_> lens
aqueous humor, provides nutrients and O2 to this region
unlike VH, constantly replaced
brings new O2 to cornea and lens and helps remove waste products

10

rhodopsin

pigment of the rods
retinal - a light absorbing molecule
derived from vitamin A

11

photopsin

also has retinal, in the cones

12

colors of cones

blue red and green

13

emmetropic

normal

14

myopic eye

too long, nearsightedness

15

hyperopia

too short eyeball, farsightedness

16

astigmatism

unequal curvature of the cornea or lens