neural pathway of eye.

Question 1

neural pathway of the eye.

Answer 1

1. ganglion cell axons meet at the optic disk.
2. at optic disks are organized.
3. optic nerves move out of orbital bone.
4. optic nerve at this point is called second cranial nerves.
5. from both eye they meet at the optic chiasm, at base of the brain.
6. nasal half of retina nerves cross over each other.
7. nasal nerves from left move with temporal nerves from right down optic tracts.
8. optic tracts move to the midbrain in the lateral geniculate nucleus( LGN ), in LGN information process takes place.
9. from LGN radiating nerve fibers radiate, out moving toward posterior portion of occipital lobe.
10. in the posterior portion of occipital lobe full interpretation of visual information take place.

Question 2

what is The primary visual receiving area?

Answer 2

primary visual cortex, Brodmann area 17.

Question 3

A lesion in one optic tract causes blindness in half of the visual field, and is called ………..

Answer 3

homonymous (same side of both visual fields)

Question 4

What is hemianopia?

Answer 4

Hemianopia, sometimes called hemianopsia, is partial blindness or a loss of sight in half of your visual field.
Homonymous hemianopsia is a condition in which a person sees only one side ― right or left ― of the visual world of each eye.