The Special Senses (Vision Part 2) Flashcards Preview

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Flashcards in The Special Senses (Vision Part 2) Deck (25):
1

A long eyeball causes the image to focus in the front of the retina and not on it (nearsightedness)

Myopia

2

A short eyeball or "lazy lens" causes the image to focus behind the retina instead of on it (farsightedness)

Hyperopia

3

Visual Receptors of the eye

Rods and Cones

4

responds to limited amounts of light

Rods

5

Black and white vision
100 times more sensitive than the other
nerve fibers converge

Rods

6

Respond to greater amounts of light

Cones

7

Color Vision
Provides a sharp image because nerve fibers don't converge

Cones

8

Spot, close to the blind spot, where the light focuses

Fovea Centralis

9

What is special about the fovea centralis

has all cones with no converging nerves, so it provides the sharpest image

10

What is the pigment in rods; "visual purple"

rhodopsin

11

When rhodopsin is exposed to light, it decomposes into

Opsin and retinol

12

Enzyme that begins a chain reaction which hyperpolarizes the receptor cell which, in turn, causes an action potential in retinal neurons

Opsin

13

what does opsin have to do to cause an action potential in retinal neurons

it begins a chain reaction which hyperpolarizes the receptor cell

14

compound synthesized from vitamin A

Retinol

15

Night blindness which is usually dues to insufficient Vitamin A, limiting rhodopsin production and leads to rod degeneration

Nyctalopia

16

What is due to pigments made from retinal and different opsins

Color Vision

17

What are the different type of cones that respond to different wavelengths of light

Erythrolabe
Chlorolabe
Cyanolabe

18

What is erythrolabe most sensitive to (erythrocyte= blood cells)

sensitive to red light waves

19

What is chlorolabe most sensitive to

sensitive to green light waves

20

What is Cyanolabe most sensitive to

sensitive to blue light waves

21

Congenital lack of one or more cone types, travels on X chromosomes

Color Blindness

22

Seeing with two eyes

Stereoscopic vision

23

What allows perception of distance and depth, as well as height and width of objects

Stereoscopic Vision

24

The perception of depth is due to

the differences in the images from the two eyes

25

How do yo actually see, in other words what is the path that a visual impulse takes

Retina-> optic nerve -> optic chiasma

some cross optic chiasma-> thalamus-> visual cortex of cerebrum

Other impulses pass into brain stem and function in various visual reflexes