organized group of cells specialized for the conduction of electrochemical stimuli from sensory receptors through a network to the site at which a response occurs.

The physical process during which sensory systems respond to stimuli and provide data for perception.

also called neural tissue, is the main tissue component of the nervous system.

The bodily system that consists of the endocrine glands and the hormones that they secrete.

the part of the nervous system comprising the brain and spinal cord.

the portion of the nervous system lying outside the brain and spinal cord.

the part of the central nervous system enclosed in the cranium of humans and other vertebrates, consisting of a soft, convoluted mass of gray and white matter and serving to control and coordinate the mental and physical actions.

the cord of nerve tissue extending through the spinal canal of the spinal column.

one or more bundles of fibers forming part of a system that conveys impulses of sensation, motion, etc., between the brain or spinal cord and other parts of the body.

several objects or a quantity of material gathered or bound together.

the appendage of the neuron that transmits impulses away from the cell body.

a nerve carrying a message toward the central nervous system.

any of a series of paired nerves that originate in the nerve roots of the spinal cord and emerge from the vertebrae on both sides of the spinal column.

physiol the section of the nervous system responsible for sensation and control of the skeletal muscles.

the system of nerves and ganglia that innervates the blood vessels, heart, smooth muscles, viscera, and glands and controls their involuntary functions, consisting of sympathetic and parasympathetic portions.

The part of the autonomic nervous system originating in the thoracic and lumbar regions of the spinal cord that in general inhibits or opposes the physiological effects of the parasympathetic nervous system, as in tending to reduce digestive secretions or speed up the heart.

The part of the autonomic nervous system originating in the brainstem and the lower part of the spinal cord that, in general, inhibits or opposes the physiological effects of the sympathetic nervous system, as in tending to stimulate digestive secretions or slow the heart.