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(FRAME-INFO (STRING "Posterior Column. \(Spinal cord images modified from N.B. Everett, Functional Neuroanatomy. Lea & Febiger, 1971, with permission of Williams & Wilkins\). The posterior column of the spinal cord is divided into two major tracts, the gracile \(L. slender\) fasciculus, and the cuneate \(L. wedge-shaped\) fasciculus; this is most clearly seen in the cervical regions.  Note how the entering primary afferent fibers are aligned somatotopically, the leg represented in the gracile fasciculus and the arm in the cuneate fasciculus.  The thoracic input is divided; caudal to the 6th thoracic cord segment it is in the gracile fasciculus, and rostral to that it is in the cuneate fasciculus.  In the lumbar cord the posterior column is not divided. The gracile and cuneate fasciculi end, respectively, in the gracile and cuneate nuclei in the medulla."))
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