Specifically, sensory neurons are activated by a sensory input via specific external and internal receptors. The cell bodies of sensory neurons are located in the dorsal root ganglia-cell body clusters just outside the spinal cord-whereas their peripheral extensions travel throughout the body. In general, neurons in the PNS receive and carry signals in the body while neurons in the CNS analyze information. The CNS consists of the brain and spinal cord whereas the PNS includes neurons that branch off from the CNS and connect to the rest of the body. The nervous system is broadly divided into two sections: the central nervous system (CNS) and the peripheral nervous system (PNS). Multiple interconnected neurons form a neural circuit and use electrical and chemical signals to quickly transmit information throughout an organism. Nerve cells, or neurons, are the basic functional units of the nervous system.
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