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Hyper sonic coloring pages. Anatomy of the visual pathway. Lesions affecting the anterior or lateral choroidal arteries may affect the lateral geniculate nucleus. Meyers loop constitutes the anteriormost extension of the optic radiation into the temporal horn.
Anterior bundle meyer loop the anterior bundle. Travel straight back through the parietal lobe to the occipital lobe in the retrolenticular limb of the internal capsule to the visual. Lesions of meyers loop tend to spare fixation as the fibers subserving the macula do not extend anteriorly.
Because these fibers essentially carry information originally derived from the ventral portion of the retina lesions to this pathway will result in a contralateral superior quadrantanopsia. A lesion in the temporal lobe that results in damage to meyers loop causes a characteristic loss of vision in a superior quadrant quadrantanopia or pie in the sky defect fibers from the superior retina. A lesion of the right meyers loop temporal lobe produces left upper quadrantic anopsia a temporal lesion anatomy.
Axial illustration showing the optic pathway and its relation with the ventricular system. The meyer loop is part of the inferior optic radiation that sweeps back on itself into the temporal lobe just lateral to the temporal horn of the lateral ventricleit can be injured in temporal lobectomy resulting in a superolateral field cut the so called pie in the sky field cut. Macular vision may be spared in these lesions particularly if the lesion is in the occipital lobe.
This pathway its correlation with the temporal horn and its implications for temporal lobe surgery are reviewed. A lesion in meyers loop causes a contralateral homonymous superior quadrantanopia sometimes termed a pie in the sky defect fig. Open image in new window.
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