visual pathways in the eye

Question 1

what does the size of the neuron and sensitivity of the receptive fled determine?

Answer 1

determines its acuity

Question 2

How is information transverted to the eye?

Answer 2

Via Retinofugal projections

these transmit visual info from the eye to the visual cortex

Question 3

explain the visual hemi field

including nasal and lateral (also called temporal) axons

Answer 3

each eye has a optic nerve
each eye revives info from the left and right visual fields
each side of the brain processes both left and visual fields

Nasal half of axons cross to opposite hemisphere
lateral half of retinal axons stay on the same

Question 4

what occurs if the left optic nerve is severed?

Answer 4

left eye blindness

Question 5

what happens if the left optic tract is severed?

Answer 5

blindness in the left nasal and right temporal field

this is called right homonymous heminaopia

Question 6

what happens if the optic chiasm is severed?

Answer 6

loss of lateral visual field

Question 7

role of optic chiasm

Answer 7

primary importance to the visual field

it is where the optic nerves cross