noting or pertaining to an involuntary response to a stimulus, the nerve impulse from a receptor being transmitted inward to a nerve center that in turn transmits it outward to an effector.

the compact area of a nerve cell that constitutes the nucleus and surrounding cytoplasm, excluding the axons and dendrites.

The part of the nervous system responsible control of the bodily functions not consciously directed, such as breathing, the heartbeat, and digestive processes.

A nerve cell that conducts impulses to a muscle, gland, or other effector.

A nerve fiber that stimulates or inhibits the action of a muscle, gland, or other nerve cell.

The branching process of a neuron that conducts impulses toward the cell

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

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.

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

The portion of the brain that is continuous with the spinal cord.

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

A wrapping of myelin around certain nerve axons, serving as an electrical insulator that speeds nerve impulses to muscles and other effectors.

An organ of soft nervous tissue contained in the skull of vertebrates, functioning as the coordinating center of sensation and intellectual and nervous activity.

The anterior and largest part of the brain

One of the major divisions of the vertebrate brain.

A usually long and single nerve-cell process that usually conducts impulses away from the cell body

A specialized, impulse-conducting cell that is a functional unit of the nervous system.

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

Each of the series of small bones forming the backbone, having several projections for articulation and muscle attachment, and a hole through which the spinal cord passes.

Any of the faculties, as sight, hearing, smell, taste, or touch, by which humans and animals perceive stimuli originating from outside or inside the body.

A junction between two nerve cells, consisting of a minute gap across which impulses pass by diffusion of a neurotransmitter.