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36 Cards in this Set
- Front
- Back
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The LENS projects the visual field
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UPSIDE DOWN
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Superior visual fields>
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Inferior Hemiretina
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Inferior visual fields>
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Superior Hemiretina
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the retina can be divided into halves:
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Hemiretina
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The LENS projects the visual field
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BACKWARDS on the retina
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Temporal visual fields>
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Nasal Hemiretina
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Nasal visual fields>
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Temporal Hemiretina
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Center of visual fields=
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clearest vision
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Optic chiasm-
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where NASAL retinal fibers cross to the contralateral optic tract
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Optict Tract-
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fibers from ipsilateral temporal retina
fibers from contralateral nasal retina carries axons from BOTH eyes |
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Right optic tract carries info from left or right visual field of both eyes?
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left
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Lateral Geniculate Nucleus goes to
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the primary visual cortex by the CALCARINE fissure
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axons from the LGN first travel in the?
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internal capsule
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Then some travel through the?
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parietal lobe
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and others travel through the?
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Temporal lobe
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to finally reach the PRIMARY VISUAL CORTEX IN THE?
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OCCIPITAL LOBE
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LINGUAL GYRUS (LOWER LIP OF THE PRIMARY VISUAL CORTEX) corresponds to?
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UPPER VISION FROM THE SUPERIOR VISUAL FIELDS
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Lingual gyrus receives fibers from the?
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TEMPORAL LOBE ( MEYERS LOOP)
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course of the lingual gyrus
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Superior visual field> inferior retina> LGN>temporal lobe>lingual gyrus
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Cuneus Gyrus
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upper wedge of the primary visual cortex
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Cuneus gyrus corresponds to the?
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lower vision projected from the inferior visual fields
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Cuneus gyrus receives fibers from what lobe?
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parietal
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route of cuneus gyrus
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inferior visual field>superior retina>LGN>parietal lobe>cuneus gyrus
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Macular vision is represented in the?
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posterior portion of the visual cortex
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Macular vision characteristics?
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center of visual field
-area of most acute vision -projected to post portion of VC |
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If loss of vision is detected-
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the examiner darkens the portion of the visual field diagram
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Homonymous-
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visual defect in the SAME portion of the visual field in BOTH EYES
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Anopia (Anopsia)
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visual defect
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Hemianopia
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visual defect in HALF of the eyes visual field
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Quadrantanopia
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visual defect in one quadrant of the eyes visual field
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Optic nerve lesion
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monocular blindness ( right eye)
-destroys afferent limb of pupillary light reflex in that eye |
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Optic chiasm in midline (tunnel vision)
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bitemporal hemianopia
-destroys crossing nasal fibers |
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Most frequent causes of optic chiasm in midline
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a) pituitary gland tumor- begins by pressing from below on the chiasm
b) aneurysm in anterior cerebral or anterior communicating artery |
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Blow to the back of the head causes loss of what vision?
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macular vision
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Visual agnosia?
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lesions in visual assocition areas of occipital lobe
inability to know/recognize what object is |
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What artery supplies the calcarine branches to the primary visual cortex on the medial surface?
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Posterior Cerebral artery
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