Visual System and Lesions
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45 questions
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- Q1Pupillary constriction is under sympathetic control, while pupillary dilation is under parasympathetic control.TRUEFALSE30s
- Q2Pupillary constriction is accomplished through which cranial nerve?CN IIICN VCN VICN IV30s
- Q3Brittany is blind in her right eye due to a lesion in her right optic nerve. As a result, when a light is shined into her left eye, what happens to her pupillary reaction?Only her left eye will dilateBoth eyes will dilateBoth eyes will constrictOnly her left eye will constrict30s
- Q4Aaron has normal vision. Shining a light in Aaron’s left eye will produce pupil constriction in:His left eyeBoth eyesNeither eye – it dilates his pupilsHis right eye30s
- Q5Briana went to the hospital because she presented with visual loss in both eyes. More specifically, she suffered from vision loss to the left visual field of her left eye, and the right visual field of her right eye, also known as bitemporal hemianopia. Briana likely has a lesion to what part of her visual pathway?Left optic nerveRight optic radiationOptic chiasmRight optic tract30s
- Q6A lesion that includes the ____________________________ will produce contralateral hemianopia with macular sparing. The macular sparing may be due to some collateral circulation from the middle cerebral arteries.Primary visual cortexLateral optic nerveOptic tractOptic chiasm30s
- Q7Lesions at or beyond the optic chiasm usually results in vision loss to one eye.TRUEFALSE30s
- Q8Layers 1 and 2 of the lateral geniculate nucleus (LGN) are comprised of ____________________ cells, while layers 3-6 are comprised of _______________________ cells.Parvocellular, magnocellularMagnocellular, parvocellularKoniocellular, magnocellularKoniocellular, parvocellular30s
- Q9The retinotopic surface of the visual cortex represents the _________________ posteriorly and the ____________________________ more anteriorly.Macula, surrounding retinaFovea, surrounding maculaSurrounding retina, maculaSurrounding retina, fovea30s
- Q10From the optic chiasm, the axons of the visual pathway travel directly to the________________, where the entire left or right visual field from both eyes is put together.Primary visual cortex in the occipital lobeLateral geniculate nucleusMedial geniculate nucleusOptic disc30s
- Q11The overlap in the visual field from each eye creates binocular vision, which is notably responsible for:Peripheral visionDepth perceptionDistant visionDouble vision30s
- Q12The right half of the visual field in each eye gets routed to the _________________________, and the left half of the visual field from each eye gets routed to the ___________________________.Inferior hemisphere, superior hemisphereLeft hemisphere, right hemisphereRight hemisphere, left hemisphereSuperior hemisphere, inferior hemisphere30s
- Q13Jennifer arrives at the ER after having a car accident and is experiencing head trauma. She presents with a headache and vomiting. The doctors are concerned about increased pressure causing blockage of flow from the retinal veins leading to swelling of the optic nerve head. This is also known as:PapilledemaGlaucomaHydrocephalus30s
- Q14The point at which retinal ganglion cell axons leave the eye and retinal blood vessels enter is called:Optic discFoveaCapsule of TenonMacula lutea30s
- Q15The _______________ is an area surrounding the fovea that has a yellowish appearance due to presences of yellow pigment.Retinal surface vesselsCapsule of TenonMaculaLamina cribrosa30s