PHYSIOLOGY
CENTRAL NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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How long does all the signaling through the sensory pathway, within the central nervous system, and through the motor command pathway take?
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1 to 2 minutes
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1 to 2 seconds
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fraction of a second
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varies with graded potential
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Explanation:
Detailed explanation-1: -The dorsal column system (sometimes referred to as the dorsal column–medial lemniscus) and the spinothalamic tract are two major pathways that bring sensory information to the brain (Figure 14.5. 1).
Detailed explanation-2: -First-order neurons travel from the cerebral cortex or brainstem and synapse in the anterior gray horn of the spinal cord. Very short second-order neurons, called interneurons, transmit the impulse to third-order neurons which are also located in the anterior grey horn at the same spinal cord level.
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