NEUROLOGY
SPASTIC PARAPARESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Day 25
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Day 26
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Day 27
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Day 28
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Detailed explanation-1: -The rostral neuropore closes on the day 25th as does the caudal neuropore on the day 28th. The embryo is 2.5 mm long at the time. Noxious factors acting during that period can affect normal closure of the caudal neuropore and distort the process of spinal cord canalization. The resultant defect is called spina bifida.
Detailed explanation-2: -Neural tube closure begins in the region of the lower medulla and proceeds both rostrally and caudally. The anterior neuropore closes at approximately 24 gestational days and the posterior neuropore closes at approximately 26 gestational days.
Detailed explanation-3: -Bending of the neural plate begins on day 22, and the cranial neuropore closes on day 24. giving rise to the lamina terminalis of the brain.