<Tr> <Td> Type II </Td> <Td> secondary </Td> <Td> Provide position sense of a still muscle, fire when muscle is static </Td> </Tr> <P> In the nervous system there is a "closed loop" system of sensation, decision, and reactions . This process is carried out through the activity of sensory neurons, interneurons, and motor neurons . </P> <P> A touch or painful stimulus, for example, creates a sensation in the brain only after information about the stimulus travels there via afferent nerve pathways . Afferent neurons are pseudounipolar neurons that have a single long axon with a short central and a long peripheral branch . These cells do not have dendrites . They have a smooth and rounded cell body . Just outside the spinal cord, thousands of afferent neuronal cell bodies are aggregated in a swelling in the dorsal root known as the dorsal root ganglion . </P> <P> Afferent is derived from Latin participle afferentem (af - = ad -: to + ferre: bear, carry), meaning carrying into . Ad and ex give an easy mnemonic device for remembering the relationship between afferent and efferent: afferent connection arrives and an efferent connection exits . </P>

Afferent and efferent axons never travel in the same nerve