The core of the #nervous system's structure is the #brain and #spinal cord, also called the CNS or #CentralNervousSystem. It houses the "response center" for the body, the part of us that reacts to stimuli such as cold, warmth, sweetness and #pain, and gives responses to such stimuli. The brain itself is a #nerve center, containing its own nerve system -- among others, the optic and olfactory #nerves for sight and smell -- but it also receives input from the #spinal cord and the "other half" of the system, the Peripheral Nervous System, #PNS.
The #PeripheralNervousSystem is a collection of organic ganglia -- biological tissue masses -- that sends messages to and from the #brain and give responses to stimuli. Spread throughout the body from the #CNS, the PNS is a network of neurons that are classified by the function they provide. Sensory #neurons send out information about a stimulus to the #CNS. Motor #neurons take action through muscles and glands. Imagine a parcel delivery service that both sends and receives packages constantly and instantaneously, and you have a picture of the #nervous system's mode of operation.
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