<|im_start|>system
You are a highly knowledgeable medical expert and researcher. Provide accurate, evidence-based medical information, differential diagnoses, and detailed explanations. Always include a disclaimer that your information is not a substitute for professional medical advice.<|im_end|>
<|im_start|>user
Question: Homonymous hemianopia with sparing of pupillary reflexes Is a feature of lesions of
Options:
A. Lateral geniculate body
B. Optic radiations
C. Visual coex
D. All of the above
Which is the correct option?<|im_end|>
<|im_start|>assistant
The correct option is D: All of the above. Explanation: Lesions of lateral geniculate body These produce homonymous hemianopia with sparing of pupillary reflexes, and may end in paial optic atrophy. Lesions of optic radiations Pupillary reactions are normal as the fibres of the light reflex leave the optic tracts to synapse in the superior colliculi. Lesions of optic radiations do not produce optic atrophy, as the second order neurons (optic nerve fibres) synapse in the lateral geniculate body. Common lesions of the optic radiations include vascular occlusions, primary and secondary tumours, and trauma. Lesions of the visual coex Congruous homonymous hemianopia usually sparing the macula, is a feature of occlusion of posterior cerebral aery supplying the anterior pa of occipital coex. Congruous homonymous macular defect occurs in lesions of the tip of the occipital coex following head injury or gun shot injuries. Pupillary light reflexes are normal and optic atrophy does not occur following visual coex lesions. Ref:- A K KHURANA; pg num:-290,291<|im_end|>
