Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Neuroanatomy > Visual System > Flashcards

Visual System Flashcards

1
Q

What are the three layers of the eye?

A

Corneoscleral coat
Uveal tract
Retina

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

What is the outermost layer of the eye?

A

Corneoscleral coat

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

What in the middle layer of the eye?

A

Uveal tract

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

What is the inner layer of the eye?

A

Retina

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

What is the cornea?

A

Transparent anterior extension of sclera

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

What is the vascular coat of the eye?

A

Uveal tract

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

What does the uveal tract consist of?

A

Iris and ciliary body anteriorly and vascularised choroid coat posteriorly

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

What does the retina consist of?

A

Layers of nerve cells, their processes, support cells and a layer of pigmented epithelium

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

What is the function of a biconcave lens?

A

Elastic to allow it to change its shape to permit accommodation for near vision

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

What is in front of the biconcave lens?

A

Two chambers (anterior and posterior)

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

What are the anterior and posterior chamber filled with?

A

Aqueous humor

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

What is posterior to the lens?

A

Vitreal cavity

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

What is the vitreal cavity filled with?

A

Vitrious humor

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

What is avascular and gleatinous due to collagen fibres and hyaluronic acid?

A

Vitrious humor

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

What covers the optic nerves?

A

Dura and arachnoid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

How many rods does the retina contain?

A

130,000,000

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

How many cones does the retina contain?

A

6,5000,000

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What does each rod contain?

A

Rhodopsin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What does each cone contain?

A

3 opsin pigments

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Are rods and cones in the retina evenly distributed?

A

No

21
Q

What colours are the cones sensitive to?

A

Red, green and blue

22
Q

What have ‘centre surround’ receptive fields with a central circular region and a ring shaped surround?

A

Retinal Ganglion Cell Receptive Fields (RGC’s)

23
Q

RGC’s can be?

A

On centre or off centre

24
Q

What are the reasons for high visual activity?

A

Thinning of retinal layers, Lack of rods, high concentrations of cones and low convergence

25
Q

Are axons myelinated within the eye?

A

No

26
Q

Are axons myelinated after passing the lamina cribrosa?

A

Yes

27
Q

What is myelin in the optic nerve formed by?

A

Oligodendrocytes

28
Q

Visual fields of the retina are described as?

A

Nasal or temporal

29
Q

Nerve fibres from the nasal part of the retina cross at?

A

Optic chiasma

30
Q

Where do fibres from the retina project to?

A

Pretectal area and superior colliculus

31
Q

Superior colliculus functions in?

A

Saccadic eye movements

32
Q

A small number of retinal fibres leave the dorsal surface of the optic chiasma and enter what?

A

Suprachiasmatic nucleus of the hypothalamus

33
Q

Fibres from what nucleus of the thalamus reach the primary visual cortex in the geniculocalcarine tracts?

A

Lateral geniculate nucleus

34
Q

What fibres form part of the internal capsule?

A

Fibres from the lateral genicuate nucleus

35
Q

What surrounds the calcimine sulcus in the occipital cortex?

A

Primary visual cortex

36
Q

What is the primary visual cortex referred to as?

A

Area 17 of Brodmann

37
Q

What can be called the striate cortex?

A

Primary visual cortex

38
Q

What is the line of Gennari?

A

A stripe of myelinated fibres found in layer IV in the primary cortex

39
Q

How many layers is the geniculate?

A

6

40
Q

What layers of the geniculate receive visual information that has crossed from the opposite eye?

A

1, 4 and 6

41
Q

What layers of the geniculate receives uncrossed fibres?

A

2,3 and 5

42
Q

Each ocular dominate column contains?

A

A complete cycle of orientation columns

43
Q

What is hemianopia?

A

Blindness for half the field of vision in one or both eyes

44
Q

What is homonymous?

A

When vision is lost on the same visual field in both eyes

45
Q

The opposite of homonymous is?

A

Heteronymous

46
Q

Other forms of partial visual field deficit is referred to?

A

Scotoma

47
Q

Frontal eye fields are thought to be involved in?

A

Saccadic movements

48
Q

Posterior eye fields are thought to be involved in?

A

Pursuit movements

Neuroanatomy (29 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions