projection fibers


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projection fibers

[prə′jek·shən ‚fī·bərz]
(anatomy)
Fibers joining the cerebral cortex to lower centers of the brain, and vice versa.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Cerebrum includes in its composition, the cerebral cortex (with a thickness between 2mm and 4mm), which is composed of gray matter (composed of local networks of neurons with dendrites and short unmyelinated axons), being located on the surface and covering the white matter (composed of very long myelinated axons which realize global and rapid nervous communication; it contains association fibers, which conduct nerve impulses between neurons corresponding to the same cerebral hemispheres-commissural fibers that connect neurons and gyri, between hemispheres and projection fibers which forms ascending and descending tracts necessary for the transmission of nerve impulses from the cerebrum into the other parts of the brain and/or spinal cord and vice versa).