The key function of the central nervous system (brain and spinal cord) is to combine the sensory signals received by sensory nerves and processes from the internal and external world and ultimately relay the nerve impulses to the effectors (muscles and glands). Neuronal circuits, consisting of just a few neurons, can be very simple, or they can require more complex neuronal networks. To stimulate or suppress their behaviour, individual neurons connect to other neurons, creating circuits that can interpret incoming input and conduct a response. In the ganglia (small bundles of nerve cells) of the sympathetic and parasympathetic nervous systems, comparatively few nerve cell bodies reside peripherally.Ī single neuron can not do so much on its own, and the role of the nervous system relies on groups of neurons working together. While axons enter all areas of the body, in the central nervous system ( brain and spinal cord), in certain regions defined as grey matter, the vast majority of nerve cell bodies remain. The "enchanted loom," which is our cortex, contains nerve cells. A neuron, which transmits a signal from one position to another, may be likened to an electrical cable. Hint:-The nervous system consists of neurons, specialised cells capable of acquiring and transmitting chemical or electrical signals, and glia, cells that provide neurons with support functions by performing a neuron-complementary information processing role.
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