Answer
Nerve
Explanation:
The CNS consists of brain and spinal card that receives information, interprete it and send response.
The peripheral nervous system consist nerves that leaves the spinal card and brain and transmit or receive signals from various areas of body.
A nerve comprises of bundles of exons or dendrites surrounded by connective tissue. Sensory neurons contain afferent axons and motor neurons have efferent fibers. In central nervous system, a bundle of axons is called tract and in the peripheral nervous system it is called as nerve.
Axons are slender long projections of neuron which transmit the signal. Exon length may vary from 1um to 20um. The longest exon in human body runs from spinal cord to base of each foot.
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