NERVOUS SYSTEM SPECIAL SENSE
SPINALCORD
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Spinal cord (in adults ends at the lower border of L. 1
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Spinal cord (in children) ends at S. 3
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Dura mater ends at S. 2
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Arachnoid mater ends at S. 2
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Filum terminale ends at coccyx
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Detailed explanation-1: -The spinal cord fills the length of the vertebral canal at the early period of intrauterine term. It is reported to extend to the level of the third lumbar vertebra at birth, because the vertebral column is growing more rapidly in the longitudinal direction than the spinal cord.
Detailed explanation-2: -In adults, the cord terminates at the level of L1-L2. Thus the cord spans within 20 bony vertebrae. In a child, it terminates at the upper border of L3.
Detailed explanation-3: -In the newborn/infant group the spinal cord terminated most frequently at the level of L2/L3 (16%).
Detailed explanation-4: -D) True. The spinal cord acts as a relay system between the body and the brain. Efferent (motor) signals from the brain travel down the spinal cord to the correct tissues and afferent (sensory) signals travel from the peripheries, up the spinal cord, and to the brain where they can be interpreted.