Sensory neurones carry electrical impulses from sensory receptors to the central nervous system (CNS), which is the brain and spinal cord.A sensory neurone has a long dendron that carries impulses from the receptor towards the cell body, and a shorter axon that carries impulses away from the cell body into the CNS. Dendrites at the end of the dendron connect with the receptor.The cell body lies to one side of the neurone, just outside the spinal cord in a swelling called the dorsal root ganglion. It contains the nucleus, many mitochondria and lots of rough endoplasmic reticulum, which are needed to make proteins and neurotransmitters.Inside the CNS the sensory neurone usually synapses with a relay neurone, which passes the impulse on to a motor neurone or to other parts of the brain.