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Meaning of GRAY MATTER

Pronunciation:  grey'matur

WordNet Dictionary
[n]  greyish nervous tissue containing cell bodies as well as fibers; forms the cerebral cortex consisting of unmyelinated neurons
 Synonyms: gray substance, grey matter, grey substance, substantia grisea
 See Also: cerebral cortex, cerebral mantle, cortex, nerve tissue, nervous tissue, pallium



Medical Dictionary
 Definition: the darker-colored tissues of the central nervous system; in the brain, the gray matter includes the cerebral cortex, the thalamus, the basal ganglia, and the outer layers of the cerebellum.
Biology Dictionary
 Definition: The portions of the brain and spinal cord which are gray and composed of the main bodies of neurons (called cytons). This is in contrast to white matter, which is the portions that are white and composed of the axons and dendrites of neurons. In the spinal cord, the gray matter is bordered by the white matter and is shaped like a butterfly when seen in cross-section.
Thesaurus Terms
 Related Terms: afferent neuron, arachnoid, arbor vitae, archipallium, autonomic nervous system, axon, bean, between brain, brain, brain stem, brains, central nervous system, cerebellar hemispheres, cerebellum, cerebral cortex, cerebrospinal fluid, cerebrum, conception, convolution, corpus callosum, corpus striatum, craniosacral nervous system, dendrite, diencephalon, discourse of reason, discursive reason, dura mater, effector organ, efferent neuron, encephalon, endbrain, esprit, fissure, folia, forebrain, fornix, frontal lobe, ganglion, glial cells, globus pallidus, gyrus, head, headpiece, hindbrain, hippocampus, hypothalamus, intellect, intellection, intellectual faculty, intelligence, internuncial neuron, lenticular nucleus, limbic lobe, little brain, lobe, mantle, medulla oblongata, medullary sheath, meninges, mens, mental capacity, mentality, mesencephalon, metencephalon, midbrain, mind, myelencephalon, neopallium, nerve, nerve trunk, nervous system, neuron, noddle, noggin, noodle, nous, occipital lobe, optic chiasm, organ of thought, pallium, parietal lobe, pate, peripheral nervous system, pia mater, pineal body, pituitary body, plexus, pons, power of reason, psyche, ratio, rationality, reason, reasoning, reasoning faculty, reticular system, rhombencephalon, sconce, seat of thought, sensation, sensorium, sensory, sensory area, sensory cell, smarts, solar plexus, spinal cord, subthalamus, synapse, telencephalon, temporal lobe, thalamus, thoracolumbar nervous system, understanding, ventricle, vermis, Vernunft, white matter, wit