Bell performed experiments to show that nerves of the body contain a mixture of sensory and motor fibers.
In his experiment he tested if the two spinal roots that originally originated from spinal nerve carry signals in opposite direction to each other just prior to their joining at the spinal cord. The dorsal roots generally joined the spinal cord from the back while the ventral roots joined the spinal cord from the front.
He experimented on animals by cutting the ventral roots and noticed muscular paralysis, later with more observation came to the conclusion that the ventral roots carry signals back to the muscles and are motor in nature. While the dorsal roots are sensory in nature thus the nerves in the body are a mixture of sensory and motor nerves.
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