Visual fields Flashcards
visual fields
what is seen by the pt without moving head
binocular
part of visual field viewed by both yees
monocular
part of VF viewed by 1 eye
peripheral vision, temporal crescent
divided into L and R visual hemifields
Left lateral geniculate
receives info from both eyes
contralateral visual world (i.e. from the ipsilateral temporal HR and contralateral nasal HR
temporal hemiretina
views the contralateral peripheral visual field
recieves info from the ipsilateral nasal half of the visual world
does not decussate
nasal hemiretina
views ipsilateral visual field
views ipsilateral temporal half of visual field
decussate at Optic chiasm and runs to c/l LGN
Meyers loop
fibers that head anterior into the temporal lobe
carry info from superior visual fields
(damage to temporal lobe cause superior visual problems)
damage to optic chiasm
causes tunnel vision due to loss of input from nasal HR which bring info from lateral fields
damage to optic tract
loss of contrslateral peripheral vision and ipsilateral central vision
optic radiation
axons from the LGN that loop out in the temporal lobe
contain Meyer loop
primary visual cortex
aka striate cx, Broadmanns area 17 anatomical name= Cuneus and Lingual gyrus
axons are geniculostriate tract (from LGN to striate cx)
pretectal nuclei
control of pupillary light reflex (just anterior to sup colliculus)
interneuons that project to ipsilateral and contralateral Edinger westphal nuclei thru the posterior commissure
Edinger westfal n.
location of preganglionic PSNS neuron cell bodies (GVE-P)
fibers run with CN III
Synapse on cilliary ganglion
cilliary ganglion
post ganglionic PSNS cell bodies
fibers run to pupillary sphincter mm. via short ciliary nn.
higher order visual processing
information is sensed by the primary visual cx
info sent out to areas 18 and 19 for processing and interpretation
dorsal=movement and where is it
ventral=temporal color and what is it
