Visual pathway anatomy from retina to occipital cortex and the visual field defect tied to a lesion at each level, tested on the NBEO.
35 cards · basic cards · AI-written, checked twice. Edit anything.
- A lesion of the optic nerve causes what visual field defect?
- Monocular vision loss in the eye on the same side as the lesion
- Where do retinal ganglion cell axons converge to exit the eye?
- The optic disc
- What retinal layer is formed by the axons of retinal ganglion cells?
- The nerve fiber layer
- Which retinal fibers decussate at the optic chiasm?
- Nasal retinal fibers
- Which retinal fibers remain uncrossed at the optic chiasm?
- Temporal retinal fibers
- A lesion at the optic chiasm classically causes what visual field defect?
- Bitemporal hemianopia
- A pituitary adenoma typically compresses the chiasm from which direction?
- From below
- Because a pituitary adenoma compresses the chiasm from below, which bitemporal field is affected first?
- The superior bitemporal field
- A craniopharyngioma typically compresses the chiasm from which direction?
- From above
- Because a craniopharyngioma compresses the chiasm from above, which bitemporal field is affected first?
- The inferior bitemporal field
- Where is a junctional scotoma lesion located?
- At the junction of the optic nerve and the optic chiasm
- What visual field pattern does a junctional scotoma produce?
- An ipsilateral central scotoma plus a contralateral superior temporal field defect
- What is Wilbrand's knee?
- A small loop that contralateral inferior nasal retinal fibers make into the opposite optic nerve just before joining the chiasm
- A lesion of the optic tract causes what visual field defect?
- Incongruous homonymous hemianopia
- The optic tract carries visual information from which part of each eye's visual field?
- The contralateral visual field of both eyes