Pie On The Floor Lesion
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Therefore lesions of the anterior parietal radiations result in contralateral congruous homonymous inferior quadrantanopia described as pie on the floor as shown in figure 8.
Pie on the floor lesion. Quadrantanopia pie in the sky. Pie on the floor defect. A lesion affecting one side of the temporal lobe may cause damage to the inferior optic radiations known as the temporal pathway or meyer s loop which can lead to superior quadrantanopia on the contralateral side of both eyes colloquially referred to as pie in the sky. Pie in the sky visual field temporal lobe lesion pie on the floor visual field parietal lobe lesion anytime the lesion is in both eyes think post chiasmal.
Homonymous incongruous quadrantanopia pie in the floor defects localize post chiasmally along the visual pathway and are generally found in the superior optic radiations of the parietal lobe. A superior homonymous loss of vision in two quarters due to a lesion of the most anterior and inferior fibres of the optic radiations in the temporal lobe involving meyer s loop on the contralateral side of the visual pathway fig. E inferior quadrantanopia pie on the floor figure 2. Contralateral homonymous superior quadrantopia pie in the sky superior optic radiations pass by the parietal lobe and therefore lesions of the parietal lobe results in a.
It is explained by the fact that inferior fibres of optic radiations contain fibres from ipsilateral lower temporal retina and contralateral lower nasal retina part of optic radiations in temporal lobe inferior quadrantic hemianopia g pie on the floor lesions. Temporal lobe lesion result in a. Also remember a lesion to the left side of the head is likely to give a right visual field defect and vice versa. Parietal lesions pie on the floor homonynous defect.
Contralateral homonymous inferior quadrantopia pie on the floor optic radiations eventually synapse in the primary visual cortex. Neuroanatomy of the visual pathway and the blood supply. Anterior temporal lobe pie on the sky homonymous. If the superior optic radiations parietal pathway are lesioned the.
The superior nasal fibres that sub serve the inferior temporal visual fields pass through the parietal lobe.
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