the sensory neurons are located in the spinal cord in the reflex arc.
where are the sensory neurons located in the reflex arc?
the spinal cord
reflex arc





























a reflex arc is a neural pathway that controls a reflex. in vertebrates, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord. this allows for faster reflex actions to occur by activating spinal motor neurons without the delay of routing signals through the brain. however, the brain will receive the sensory input while the reflex is being carried out and the analysis of the signal takes place after the reflex action.
reflex arc
the scratch reflex is a response to activation of sensory neurons whose peripheral terminals are located on the surface of the body. some sensory neurons can be activated by stimulation with an external object such as a parasite on the body surface. alternatively, some sensory neurons can respond to a chemical stimulus that produces an itch sensation. during a scratch reflex, a nearby limb reaches toward and rubs against the site on the body surface that has been stimulated. the scratch reflex has been extensively studied to understand the functioning of neural networks in vertebrates. despite decades of research, key aspects of the scratch reflex are still unknown, such as the neural mechanisms by which the reflex is terminated.
scratch reflex