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20 Cards in this Set
- Front
- Back
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What supplies blood to meyers loop?
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the middle cereberal artery
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what supplies blood to the primary visual cortex?
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posterior cerebral artery in the medial sections
and middle cereberal artery in the posterior lateral sections (where the fovea goes) |
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What limb of the internal capsule carries info from the thalamus to primary visual cortex?
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the retrolenticular limb of internal capsule
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what is scotoma?
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this is a loss in the center of the visual feild, surrounded by normal vision.
Caused by compression of the central artery of the retina- leads to death of fibers in the middle of the optic nerve |
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What things can caused ipsilateral blindness in one eye?
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destruction of optic nerve, retina on one side.
aneurysm of ophthalmic artery- This is a branch off the ICA |
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What causes bitemporal heteronymous hemianopia?
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this is destruction of the crossing fibers from the nasal retina. (which sees the lateral/temporal vision area)
caused by pituitary tumor, or destruction of the optic chiasm. |
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What causes nasal hemianopia?
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this the the loss of the information coming from the lateral/temporal retina. This would be due to an ICA aneurysm pressing on the lateral portion of the optic chiasm.
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What causes contralateral homonymous hemiaopia?
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this would be a destruction of the optic tract, LGN, optic radiation, or primary visual cortex on one side
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What supplies blood to the optic tract?
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the anterior chorodial artery off the ICA
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what supplies blod to the LGN?
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the thalamogeniculate artery off of PCA
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What supplies blood to the lateral branches of the optic radiation/posterio-lateral primary visual cortex?
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middle cerebreal artery
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what supplies blood to the medial branches of the optic radiation/ medial anterior portion of the primary visual cortex?
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the posterior cerebral artery (and its offshoot the calcarine artery)
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What causes Contralteral superior quadrantanopia?
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this is destruction of meyers loop, either by trauma or MCA loss.
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In a detached retina, what layers separate?
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the retina separates from the pigment epithelium
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In macular sparing, what artery is occluded, and what artery remains patent?
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the calcarine artery is blocked, causing loss in the anterior portion of the primary visual cortex
the posterior portion is spared due to the middle cerebral artery |
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What is the pathway for the pupillary light reflex? (pupillary sphincter)
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Light in-> bypass LGN-> pretectal nucleus on one side-> bilaterally E/W nucleus-> follows CN 3 down to cillary ganglion-> pupillary sphincter muscle
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What is the pathway for the pupillary dilation reflex?
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this is controlled by sympathetics.
hypothalamus-> superior cervical ganglion-> ascending fibers-> goes to pupillary dilatory muscle |
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What happens during the accommodation reflex?
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medial rectus contracts, pupillary sphincter contracts, lens thickens/rounds up due to contracton of cillary muscles. and relaxation of suspensory ligaments
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What is amblyopia?
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this is a lack of visual stimulation during early development, this leads to development of only one set of ocular dominance columns. leads to lack of stereopsis.
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what is visual agnosia?
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this is the inability to recognize objects that are perceived.
- caused by damage in visual association cortex, broadmann areas 18/19. |
