nervous system

American  

[nur-vuhs sis-tuhm] / ˈnɜr vəs ˌsɪs təm /

noun

Anatomy, Zoology.

• nervous systems
  plural

1. the system of nerves and nerve centers in an animal or human, including the brain, spinal cord, nerves, and ganglia.

2. a particular part of this system.

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nervous system British  

noun

1. the sensory and control apparatus of all multicellular animals above the level of sponges, consisting of a network of nerve cells See neurone See also central nervous system

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nervous system Scientific  

/ nûr′vəs /

1. The system of neurons and tissues that regulates the actions and responses of vertebrates and many invertebrates. The nervous system of vertebrates is a complex information-processing system that consists mainly of the brain, spinal cord, and peripheral and autonomic nerves. It receives chemical information from hormones in the circulating blood and can also regulate secretions of the endocrine system by the action of neurohormones. The nervous systems of invertebrates vary from a simple network of nerves to a complex nerve network under the control of a primitive brain.

2. See also autonomic nervous system central nervous system peripheral nervous system

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nervous system Cultural  

1. The system in the body that controls internal functions of the body and receives, interprets, and responds to stimuli. The nervous system is made up of the brain, the spinal cord, the nerves, and the sense organs, such as the eye and ear.

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Other Word Forms

Noun Inflected Forms

• nervous systems
  plural

Etymology

Origin of nervous system

First recorded in 1730–40

Example Sentences

See Examples For:

nervous system

I brace my nervous system for the piercing shriek, let it play like my own little theme song.

From Los Angeles Times ● Aug. 12, 2026

But equally, a delayed response or a friend failing to follow through on plans can trigger subtle stress responses in the nervous system.

From BBC ● Jul. 28, 2026

Parkinson’s disease, according to the Mayo Clinic, is a nervous system movement disorder that worsens with time and cannot be cured.

From Los Angeles Times ● Jul. 27, 2026

Instead of immediately trying to regulate my nervous system, I let myself feel worried and sad.

From The Wall Street Journal ● Jul. 19, 2026

As Colbert and Chamberlin observed, “there is a nervous system, of wires and printers’ types, which connect all together, and . . . places Chicago in close rapport with all parts of the world.

From "The Great Fire" by Jim Murphy