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Flashcards in Visual System Deck (30):
0

This is the SMALLER chamber of the eye located in the FRONT of the LENS.

Aqueous Humor

*Fig 6.4 p.132*

1

This is the LARGER chamber of the eye located BEHIND the LENS.

Vitreous Humor

*Fig 6.4 p.132*

2

Name the 3 layers of the EYE.

Sclera
Choroid
Retina

*Fig 6.4 p.132*

3

The CORNEA is the translucent later in front of the _____________.

Sclera

*Fig 6.4 p.132*

4

This is the INNERMOST layer of the eye and contains receptors for vision.

Retina

*Fig 6.5 p.134*

5

This part of the eye PREVENTS the ESCAPE OF LIGHT from the eye.

Choroid Layer

*Fig 6.4 p.132*

6

These EYE MUSCLES are on the OUTSIDE of the eyeball and are responsible for EYEBALL MOVEMENT.

Extrinsic Muscles

*Fig 6.4 p.132*

7

These muscles are on the INSIDE of the eyeball .

Intrinsic Muscles

*Fig 6.4 p.132*

8

These INTRINSIC muscles CONTROL the LENS.

Ciliary Muscles

*Fig 6.4 p.132*

9

These INTRINSIC muscles CONTROL the PUPIL.

Iris

*Fig 6.4 p.132*

10

These are PRIMARY RECEPTOR NEURONS that are RESPONSIVE TO LIGHT. (2)

Rods
Cones

*Fig. 6.5 p.134*

11

True or False: rods and cones are specialized receptors.

TRUE, rods and cones are SPECIALIZED

12

These NEURONS synapse with receptor cells and occur in the SECOND ROW.

Bipolar Neurons

*Fig. 6.5 p.134*

13

The bipolar neurons bring the impulse to the THIRD GROUP of neurons called __________.

Ganglion Cells

*Fig 6.5 p.134*

14

This occurs when the axons of ganglion cells EXTEND OVER the INNER SURFACE OF THE RETINA and form the the optic nerve.

Blind Spot

*Fig. 6.5 p.134*

15

These LATERAL NEURONS pick up info FROM RECEPTOR CELLS and spread effects TO several BIPOLAR NEURONS.

Horizontal Cells

*Fig 6.5 p.134*

16

These LATERAL NEURONS pick up info FROM BIPOLAR CELLS and spread effects TO several GANGLION CELLS.

Amacrine Cells

*Fig 6.5 p.134*

17

CONES are concentrated at the ____________ part of the back of the retina and become sparser in the ____________.

Central
Periphery

*Fig. 6.9 p.137*

18

The RODS are NUMEROUS in the ___________ and ABSENT in the ____________ of the retina.

NUMEROUS in PERIPHERY

ABSENT in the CENTER

*Fig. 6.9 p.137*

19

This is the part of the retina BEHIND the LENS also known as the YELLOW SPOT.

Macula Lutea

*Fig. 6.6 p.136*

20

This is located in the CENTER OF the MACULA LUTEA of the retina.

Fovea Centralis

*Fig. 6.6 p.136*

21

Fovea Centralis is the area of _____________ vision and contains ___________ cones.

Sharpest vision
50,000 cones

*Fig. 6.6 p.136*

22

Why does the FOVEA produce such a SHARP IMAGE?

Because the BIPOLAR and GANGLION CELLS are drawn aside at an OBLIQUE ANGLE so that the CONES ARE EXPOSED TO LIGHT RAYS.

*Fig 6.6 p.136*

23

The VARIOUS KINDS OF LIGHT may be specified in terms of what TWO (2) VARIABLES?

Intensity
Wavelength

24

This is the UNIT commonly employed for DESIGNATION OF WAVELENGTH.

Millimicron

25

VERTABRATE eye SENSITIVE to WAVELENGTHS between ____ and ____ millimicrons.

380-760

26

This depends on SIZE OF PUPIL through which light enters the eye.

Retinal Illumination

27

This depends on RETINAL ILLUMINATION.

Size of Pupil

28

True or False: the wider the APERTURE the sharper the focus of the retinal image.

FALSE, the NARROWER the aperture the sharper the focus of the image

29

The FOCUS IS BEST when the illumination is _________ and the pupil is _________.

High
Constricted