Lecture 27 - Neuroanatomy of Visual Pathway Flashcards Preview

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Flashcards in Lecture 27 - Neuroanatomy of Visual Pathway Deck (34)
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1
Q

What is the pathway of light?

A

Cornea, iris, lens, and retina

2
Q

What is light captured by in the eye?

A

Specialized epithelial cells in the retina

3
Q

What are the names of the photoreceptors in the eye?

A

Rods and cones

4
Q

What does light pass through before getting to the photoreceptors?

A

Many non-photosensitive neural layers

5
Q

What are the layers of the retina? (A to P)

A

Optic nerve fibers - Cell bodies of retinal ganglion n. - Internal nuclear layer - External nuclear layer - Outer and inner segments of photoreceptors - pigment epithelium

6
Q

What do rods sense?

A

Vision in light of low intensity

7
Q

How many types of rods are there?

A

one

8
Q

What do cones sense?

A

Visual activity and color vision

9
Q

What are the types of cones?

A

Short and medium

10
Q

What are cones sensitive to?

A

Wavelengths

11
Q

Where are robs mostly located?

A

Periphery of retina

12
Q

What is the ratio of rods to bipolar neurons?

A

Many rods : Biopolar neuron

13
Q

What is the ratio of cones to bipolar neurons?

A

Few cones : Bipolar neruon

14
Q

What is within the internal nuclear layer?

A

Cell bodies of bipolar neurons and other neurons

15
Q

What is within the external nuclear layer?

A

Cell bodies of photoreceptors

16
Q

What does 3 cones at higher density provide?

A

Higher acuity

17
Q

What does 2 cones at lower density provide?

A

Higher sensitivity

18
Q

What do human rods provide?

A

Spatial detail but darker image

19
Q

What do feline rods provide?

A

Higher sensitivity or brighter image

20
Q

What is the basic retinal pathway?

A

Photoreceptors - Bipolar neurons - Retinal ganglion neurons

21
Q

What is the “path” of the optic nerve?

A

Nerve - Chiasm - Tract

22
Q

What is the function of the optic nerve?

A

Relay information from retinal ganglion cells to the lateral geniculate nucleus

23
Q

Where is the geniculate nucleus?

A

In the thalamus

24
Q

What surrounds the retinal ganglion cells?

A

Meninges

25
Q

What is the retinogeniculostriate pathway?

A

Retinal ganglion - lateral geniculate nucleus of thalamus - primary visual cortex

26
Q

What are the three structure formations in the occipital lobe?

A

Loop of meyer, optic radiation (ventral and dorsal)

27
Q

Where is the optic radiation of the ventral part?

A

Temporal lobe

28
Q

Where is the optic radiation of the dorsal part?

A

Parietal lobe

29
Q

Which tract does the nasal field of the right eye go?

A

Right optic tract

30
Q

Which tract does the temporal field of the right eye go?

A

Left optic tract

31
Q

Where do the temporal fields cross?

A

Optic chiasm

32
Q

What happens if there is a lesion in the optic nerve?

A

Blindness in that eye

33
Q

What happens if there is a lesion in the optic chiasm?

A

Loss of temporal field

34
Q

What happens if there is a lesion in the optic tract?

A

Loss of temporal field in opposite eye and loss of nasal field in same eye