blood supply to visual pathways

ophthalmic A

blood supply to the retina

emboli, stenosis, vasculitis

3 causes of impaired blood flow

central retinal A

branch of ophthalmic A that supplies the inner retinal layers

sup and inf retinal As

branches off retinal A

monocular altitudinal scotoma

occlusion in sup or inf retinal A causes

right eye, inf

occlusion of right sup retinal A would cause ___ visual field loss

amaurosis fugax

transient occlusion of sup or inf branch of retinal A; lasts about 10 min

amaurosis fugax

browning out

amaurosis fugax

most common cause is ipsilat ICA stenosis

ACA and MCA

optic ns, optic chiasm and optic tracts receive blood supply from numerous small branches from ___ so rarely see clinically significant infarcts

ant choroidal branch (from ICA), branches from PCA, thalamogeniculate A

LGN blood supply

sup division of MCA

sup optic radiations passing thru parietal lobe receives blood from

sup division of MCA

infarct here would cause contralat sup quadrantanopia

inf division of MCA

inf optic radiations passing thru temporal lobe receives blood supply from

inf division of MCA

infarct here would cause contralat inf quadrantanopia

PCA

primary visual cortex is supplied by