A bitemporal hemianopsia is caused by a lesions in both lesion in the optic chiasm lesion in the center fields of the fovea lesion in both lateral geniculate bodies optical nerves
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- Larry goes to the doctor complaining that he cant see the right side of the visual field with either eye. Where in the visual signal-processing pathway is Larrys problem occurring?Strabismus (stra-biz′mu˘ s) is a condition in which one or both eyes deviatein a medial or lateral direction. In some cases, strabismus is caused by aweakness in either the medial or the lateral rectus muscle. If the lateralrectus of the right eye is weak, in which direction does the eye deviate?Where will a patient with lesion off the right optic radiation report loss of vision ? Both temporal visual Both nasal visual Left eye Right eye Left visual Right visual.
- Describe the effect on vision of a tumor in the hypothalamus or pituitary gland that compresses the optic chiasma, destroying the axons crossing through this structure.A lesion in either optic tract can cause a field. in the binocular zone of the visual partial anopsia ipsilateral hemianopsia contralateral hemianopsia spared vision in the opposite half of the vision fieldDefine optic stalk
- Many people think that vision is processed solely in the occipital lobe, and language in the temporal. Discuss why this is a poor heuristic and name at least three areas of major processing overlap in the frontal and/or parietal lobes.Define optic vesicleWhat is the visual outcome if the specific extrinsic eye muscle involved in convergence reflex did not function?
- Three patients have suffered destruction of different portions of their visual pathway. Patient 1 has lost the right optic tract, patient 2 has lost the nerve fibers that cross at the optic chiasm, and patient 3 has lost the left occipital lobe. Draw a picture of what each person would perceive through each eye when looking at a white wall.A patient comes into the ER complaining of loss of vision. When tested, he seems to be missing visual information from both left and right temporal hemifields. What part of the visual pathway is most likely damaged?Assuming that someone is looking forwards while sitting in an office chair, which structure is most activated when spun in a circle? Crista ampullaris of the posterior semicircular canal Crista ampullaris of the anterior semicircular canal Crista ampullaris of the lateral semicircular canal Saccular maculae
