Gray matter

Definition

Gray matter is a major component of the central nervous system, consisting primarily of neuronal cell bodies, dendrites, unmyelinated axons, and glial cells. It is involved in muscle control, sensory perception such as seeing and hearing, memory, emotions, and speech.

Related terms

Neuron: A specialized cell transmitting nerve impulses; a nerve cell.

Dendrites: The branched projections of neurons that act to conduct the electrochemical stimulation received from other neural cells to the body or soma of the neuron from which they project.

Glial Cells: Non-neuronal cells in the central nervous system and peripheral nervous system that do not produce electrical impulses but maintain homeostasis, form myelin, and provide support and protection for neurons.