Visual System Flashcards

0
Q

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

A

Vitreous Humor

Fig 6.4 p.132

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

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

A

Aqueous Humor

Fig 6.4 p.132

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Name the 3 layers of the EYE.

A

Sclera
Choroid
Retina

Fig 6.4 p.132

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

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

A

Sclera

Fig 6.4 p.132

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

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

A

Retina

Fig 6.5 p.134

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

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

A

Choroid Layer

Fig 6.4 p.132

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

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

A

Extrinsic Muscles

Fig 6.4 p.132

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

These muscles are on the INSIDE of the eyeball .

A

Intrinsic Muscles

Fig 6.4 p.132

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

These INTRINSIC muscles CONTROL the LENS.

A

Ciliary Muscles

Fig 6.4 p.132

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

These INTRINSIC muscles CONTROL the PUPIL.

A

Iris

Fig 6.4 p.132

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

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

A

Rods
Cones

Fig. 6.5 p.134

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

True or False: rods and cones are specialized receptors.

A

TRUE, rods and cones are SPECIALIZED

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

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

A

Bipolar Neurons

Fig. 6.5 p.134

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

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

A

Ganglion Cells

Fig 6.5 p.134

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

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

A

Blind Spot

Fig. 6.5 p.134

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

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

A

Horizontal Cells

Fig 6.5 p.134

16
Q

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

A

Amacrine Cells

Fig 6.5 p.134

17
Q

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

A

Central
Periphery

Fig. 6.9 p.137

18
Q

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

A

NUMEROUS in PERIPHERY

ABSENT in the CENTER

Fig. 6.9 p.137

19
Q

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

A

Macula Lutea

Fig. 6.6 p.136

20
Q

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

A

Fovea Centralis

Fig. 6.6 p.136

21
Q

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

A

Sharpest vision
50,000 cones

Fig. 6.6 p.136

22
Q

Why does the FOVEA produce such a SHARP IMAGE?

A

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
Q

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

A

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