Lab Quiz 8

Question 1

where do optic (visual) radiation fibers project?

Answer 1

fibers leave the lateral geniculate nucleus of the thalamus and project to the visual cortex

Question 2

what is the pupillary light reflex?

Answer 2

optic nerve (CN II) carries afferent information: optic nerve -> passes through optic chiasm but stays ipsilateral -> optic tract -> LGN -> superior brachium -> pretectal area
oculomotor nerve (CN III) carry efferent information: edinger-westphal nucleus of CN III -> CN III -> ciliary ganglion -> short ciliary nerve -> pupil

Question 3

why do dog and cats eye shine in light?

Answer 3

there is non-pigmented portion of the choroid called the tapetum lucidum, this provides a surface that reflects light within the vitreous chamber and back onto the retina to enhance sensitivity as an adaption to functioning in low-light conditions

Question 4

what is hemianopia/hemianopsia?

Answer 4

loss of half the visual field