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Test_11_Answers - CBNS106 Answer Key Test_13 1 Which of the...

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CBNS106 Page 1 of 4 Answer Key - Test_13: 1. Which of the following is the common characteristic in the receptive fields in the ganglion cells of the retina, the LGN, and striate cortex neurons in layer IVC? Choose the correct option. A) Center surround antagonism B) Elongated bar of light moving across the receptive field C) Optimal orientation of a bar of light D) Radial column of cells from pia to white matter 2. Where are the first binocular neurons encountered in the retinofugal projections? Choose the correct option. 3. Mr. Stewart underwent a surgery to remove a tumor in his brain. During the surgery, lesions developed in the optic radiations. What is the potential impact of these lesions? Choose the correct option. 4. Susan fell down the staircase and injured her head, causing a transection of the left optic nerve. What is the consequence of this lesion? Choose the correct option. Answer Key - Test_13 1. A 2. B 3. A 4. B
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CBNS106 Page 2 of 4 Question 5: Following a bicycle accident, you are disturbed to find that you are unable to see anything in the left visual field. Where has the retinofugal pathway been damaged? Answer 5: Lesions anywhere in the retinofugal projection from the eye to the lateral geniculate nucleus (LGN) to the visual cortex may cause specific visual deficits depending on the site of the lesion. The bicycle accident has resulted in a transection of the right optic tract , resulting in blindness in the left visual field as viewed through either eye. Axons from the nasal retina of the left eye and temporal retinal of the right eye have been damaged. In contrast, a transaction of the right optic nerve would render a person blind in the right eye because both nasal and temporal axons originating from the right eye would be damaged; none of the axons in the optic nerve have crossed to the opposite side of the brain. Crossing, or decussation, occurs at the optic chiasm, which lies between the optic nerve and the optic tract.
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