Lecture 27 - Neuroanatomy of Visual Pathway Flashcards Preview

Anatomy > Lecture 27 - Neuroanatomy of Visual Pathway > Flashcards

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

What is the pathway of light?

Cornea, iris, lens, and retina

2

What is light captured by in the eye?

Specialized epithelial cells in the retina

3

What are the names of the photoreceptors in the eye?

Rods and cones

4

What does light pass through before getting to the photoreceptors?

Many non-photosensitive neural layers

5

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

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

6

What do rods sense?

Vision in light of low intensity

7

How many types of rods are there?

one

8

What do cones sense?

Visual activity and color vision

9

What are the types of cones?

Short and medium

10

What are cones sensitive to?

Wavelengths

11

Where are robs mostly located?

Periphery of retina

12

What is the ratio of rods to bipolar neurons?

Many rods : Biopolar neuron

13

What is the ratio of cones to bipolar neurons?

Few cones : Bipolar neruon

14

What is within the internal nuclear layer?

Cell bodies of bipolar neurons and other neurons

15

What is within the external nuclear layer?

Cell bodies of photoreceptors

16

What does 3 cones at higher density provide?

Higher acuity

17

What does 2 cones at lower density provide?

Higher sensitivity

18

What do human rods provide?

Spatial detail but darker image

19

What do feline rods provide?

Higher sensitivity or brighter image

20

What is the basic retinal pathway?

Photoreceptors - Bipolar neurons - Retinal ganglion neurons

21

What is the "path" of the optic nerve?

Nerve - Chiasm - Tract

22

What is the function of the optic nerve?

Relay information from retinal ganglion cells to the lateral geniculate nucleus

23

Where is the geniculate nucleus?

In the thalamus

24

What surrounds the retinal ganglion cells?

Meninges

25

What is the retinogeniculostriate pathway?

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

26

What are the three structure formations in the occipital lobe?

Loop of meyer, optic radiation (ventral and dorsal)

27

Where is the optic radiation of the ventral part?

Temporal lobe

28

Where is the optic radiation of the dorsal part?

Parietal lobe

29

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

Right optic tract

30

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

Left optic tract

31

Where do the temporal fields cross?

Optic chiasm

32

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

Blindness in that eye

33

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

Loss of temporal field

34

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

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