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As it is pointed out in the passage, there are so many nerve fibres in the spinal cord that ----.
Protected inside the bony vertebrae of the spine is an
inch-thick gelatinous bundle of nervous tissue called
“the spinal cord”, which acts as the central
communication conduit between the brain and the
rest of the body. Millions of nerve fibres carry motor
information from the brain to the muscles, while other
fibres bring sensory information from the body to the
brain. In its structure and functions, the spinal cord
may be compared to a transcontinental telephone
cable jam-packed with wires, each of which carries
messages both ways. But what happens if that cable
is cut? Signals cannot get through, communication is
lost, and the cable must be repaired or replaced. In
humans, though, this is not a simple process due to
the sensitive nature of the spinal cord. The spinal
cord is rarely severed because the vertebrae provide
rigid protection. However, a traumatic blow to the
spinal column and subsequent bleeding, swelling and
scarring can crush the delicate nerve bundles and
prevent signals from passing. The result may be a
debilitating injury.