Visual Pathways

Question 0

Where are ganglion cell receptive fields smallest?

Answer 0

At the fovea

Get larger as you move outwards

Question 1

What photoreceptors are found in the fovea?

Answer 1

Just cones

Question 2

What is seen in optic chasm lesion (eg crushed by pituitary tumour)

Answer 2

Bitemporal hemianopia

Lose half of vision on temporal sides

Question 3

What is seen in a right hand side optic tract lesion?

Answer 3

Homonymous hemianopia

Lose half if vision, in left half of each eye

Question 4

Explain why macula sparing can occur

Answer 4

Blood supply- The arteries may not be effected by what caused the lose if vision

Question 5

If you fall backwards on your head and damage that part if the brain- where may vision lose be?

Answer 5

Where the macula is

Question 6

How many layers are in the lateral geniculate nucleus (thalamus)?

Answer 6

6

Question 7

What is the functional unit of the cortex?

Answer 7

Columns

Question 8

What cells are found in layers 1 & 2 of the lat gen nuc?

Answer 8

Magnocellular

Question 9

What cells are found in layers 3-6 of the lat gen nuc?

Answer 9

Parvocellular