The corticospinal tract is a descending tract of the spinal cord which contains bundles of axons which originate in the cerebral cortex and descend to synapse within the brainstem or spinal cord. The neurons are called "upper motor neurons".
by Greg Dunn. Dendrite- the bushy, branching extensions of a neuron that receive messages and conduct impulses toward the cell body/ Axon- the extension of a neuron, ending in branching terminal fibers, through which messages pass to other neurons of to
Neuroscientists Discover New Phase of Synaptic Development. Carnegie Mellon University neuroscientists have discovered a new intermediate phase in neuronal development during which repeated exposure to a stimulus shrinks synapses.