(IMAGE (TYPE "GIF") (PATH "gifs/Syllabus Chapters/Descending Corticospinal/corslab.mot.f81eb.gif")) (OUTLINE-COLOR (NAME "YELLOW")) (STRING-COLOR (NAME "RED")) (PIN-COLOR (NAME "RED")) (FRAME-INFO (STRING " Descending Fiber. In this frontal section, a descending neuron \(blue\) originating in the precentral gyrus \(primary motor cortex\), passes in turn through the central white matter, the posterior limb of the internal capsule, the crus cerebri \(cerebral peduncle\), and the base of pons. Most corticobulbar fibers end contralaterally on neurons in the cranial nerve motor nuclei. Corticospinal fibers continue through the pyramid in the medulla \(not shown\) and cross to the lateral funiculus of the spinal cord before terminating in the spinal cord gray. Thus, damage to the motor cortex or to the corticospinal tract on one side of the brain rostral to the medulla will result in motor deficit in the contralateral side of the body.")) 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