. A text-book of physiology : for medical students and physicians . help to form the tracts into which this white mattermay be divided (2 and 3 of Fig. 73). These tract cells are foundthroughout the gray matter, and, according to the side on which theaxon enters into a tract, they may be divided into three subgroups:(a) Those whose axons enter the white matter on the same side of 162 SPINAL CORD AS A PATH OF CONDUCTION. 163 the cord, the tautomeric tract cells of Van Gehuchten. (b)Those whose axons pass through the anterior white commissureand thus reach the tracts in the white matter of the o
. A text-book of physiology : for medical students and physicians . help to form the tracts into which this white mattermay be divided (2 and 3 of Fig. 73). These tract cells are foundthroughout the gray matter, and, according to the side on which theaxon enters into a tract, they may be divided into three subgroups:(a) Those whose axons enter the white matter on the same side of 162 SPINAL CORD AS A PATH OF CONDUCTION. 163 the cord, the tautomeric tract cells of Van Gehuchten. (b)Those whose axons pass through the anterior white commissureand thus reach the tracts in the white matter of the other are known as commissural cells or the heteromeric tractcells of Van Gehuchten. They form one obvious means for crossedconduction in the cord, (c) Those whose axons divide into two,one passing into the white matter of the same side, the other pass-ing by way of the anterior commissure to reach the white matterof the opposite side—the hecateromeric tract cells of Van Gehuch-ten. (3) The Golgi cells of the second type—that is, cells whose Dorsal. L/entral Fig. 73.—Schema of the structure of the cord.—After Lenhossek.) On the right thenerve cells; on the left the entering nerve fibers. Right side: 1, Motor cells, anteriorcolumn, giving rise to the fibers of the anterior root; 2, tract cells whose axons pass intothe white matter of the anterior and lateral funiculi; 2, commissural cells whose axons passchiefly through the anterior commissure to reach the anterior funiculi of the other side;4, Golgi cells (second type), whose axons do not leave the gray matter; 5, tract cells whoseaxons pass into the white matter of the posterior funiculi. Left sid?: 1, Entering fibersof the posterior root, ending, from within outward, as follows: Clarkes column, posteriorcolumn of opposite side, anterior column same side (reflex arc), lateral column of same side,posterior column of same side; 2, collaterals from fibers in the anterior and lateral funiculi,3, collaterals of de
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