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nervous system
An organ system that coordinates the activities of muscles, monitors organs, constructs and processes data received from the senses, and initiates actions.
nervous systems
plural of nervous system
vegetative nervous system
(neuroanatomy) The autonomic nervous system.
enteric nervous system
A subdivision of the peripheral nervous system that directly controls the gastrointestinal system.
somatic nervous system
The part of the peripheral nervous system that transmits signals from the central nervous system to skeletal muscles, and from receptors of external stimuli, thereby mediating sight, hearing and touch.
peripheral nervous system
(neuroanatomy) The part of the nervous system which is not the central nervous system.
autonomic nervous system
(neuroanatomy) In humans and other vertebrates, the part of the nervous system that regulates the involuntary activity of the heart, intestines and glands. These activities include digestion, respiration, perspiration, metabolism, and the modulation of blood pressure.
central nervous system
(neuroanatomy) In vertebrates, that part of the nervous system comprising the brain, brainstem and spinal cord.
parasympathetic nervous system
(neuroanatomy) One of the divisions of the autonomic nervous system, based between the brain and the spinal cord, that slows the heart and relaxes muscles.
sympathetic nervous system
(neuroanatomy) The part of the autonomic nervous system that raises blood pressure and heart rate, constricts blood vessels, and dilates the pupils when under stress.
