Visual System - 4/22 Stephens Flashcards
Information from the Lower hemiretina projects where?
Lateral part of LGB, Loop of Meyer, and Lingual gyrus
Lesion of the primary visual cortex results in what?
Contralateral homonymous hemianopia with macular sparing
Left incongruent homonymous hemianopia with macular sparing results from what?
Congruent visual field deficits are usually due to what?
Lesion of the right primary visual cortex
LGB or optic radiations
A unilateral lesion of the lateral aspect of the optic chiasm results in what?
Nasal hemianopia of the ipsilateral eye
Lesion of temporal retina of the left eye results in what?
Right nasal hemianopia of the LEFT EYE
Contralateral superior quadrantanopia is normally a result of what?
What else can cause it?
Unilateral lesion of the Loop of Meyer
Tumor or infarct of Posterior Temporal Lobe
A lesion in the right loop of Meyer would result in what?
Left superior quarantanopia
Bitemporal hemianopia is a result of what?
Usually caused by what?
Midline lesion of the medial portion of the optic chiasma
Pituitary tumor
What controls nonvolitional eye movements?
What associated structure?
Occipital eye fields in the visual association cortex
Superior colliculus
Voluntary movements of the eyes are controlled by what?
Frontal eye fields, post part of middle frontal gyrus
Contralateral homonymous hemianopia is a result from a lesion where?
Unilateral lesion of LGB, complete optic radiations, or visual cortex
Binasal hemianopia is due to a lesion where?
Also frequently due to what?
Bilateral lesion of the lateral aspects of the optic chiasma
Atherosclerosis of the ICA
Monocular blindness due to what?
Unilateral lesion of the optic nerve
Which fibers cross in the optic chiasma: temporal or nasal hemiretina?
Nasal hemiretina
