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Flashcards in visual pathways Deck (11):
1

how can rods join the cone pathways

via amacrine cells

2

what are the five projections of the optic tracts

dLGN, superior colliculus, accesory optic nuclei, pretectal area, SCN

3

what do melanopsin retinal ganglion cells do

signal light levels. Pretectal and SCN paths

4

difference b/w melanopsin containing and rods and cones

depolarize in response to light and lasts as long as the stimulus withough adaptation

5

efferent limb failure

failure of one pupil to constrict when light is shined in eigher eye, with normal constriction of other pupil

6

why do you get preserved near response in MLF syndrome

b/c the third nucleus doesnt get gaze command but it does get near response command

7

deficit seen in LGN lesion

slightly non-corresponding (almost homonymous) deficits due to laminar segregation.

8

where do you see exactly corresponding visual field deficits

occipital cortex

9

route of upper field information. Lower field information

through meyer's loop to lower bank of calcarine fissure. Parietal path to upper bank

10

Extrastriate lesions: temporal, parietal, occipito-temporal

loss of recognition and memory; visual inattention and neglect; loss of recognition of faces

11

rule of thumb for localizing lesions: the more homonymous, the more ___ the lesion. The higher in the upper field, the more ___ the lesion

posterior; lateral