A text-book of physiology, for medical students and physicians . d, 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: 163 164 PHYSIOLOGY OF CENTRAL NERVOUS SYSTEM. (a) Those whose axons enter the white matter on the same side ofthe 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 ot
A text-book of physiology, for medical students and physicians . d, 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: 163 164 PHYSIOLOGY OF CENTRAL NERVOUS SYSTEM. (a) Those whose axons enter the white matter on the same side ofthe 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 arc known as commissural cells or the heteromeric tractcoll- of Van (rehuchten. They form one obvious means for crossedconduction in the cord, (c) Those whose axons divide into two,one j:>assing 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. Uentral Fjk. 73.—Schema of the structure of the cord.—After Lenhossek.) On the right thenerve cells; on tin- left the entering nerve fibers. Right side: 1, Motor cells, anteriorcolumn, giving rise to the fibers f the anterior root; -, tract cells whose axons pass intothe white matter of I hi an t et ior and lateral funiculi; -, commissural eel Is whose axons passchiefly through the anterior commissure to reach the anterior funiculi of the other side; 4, Golgi cells i econd I pe), whose axon do nol leave the may matter; .r>, tract cells whose ;.i into the white matter of the posterior funiculi. Leftside: L, Entering libers of tin- po terioi , ending, from within outward, as follows: Clarkes column, posterior Column ol oppo ite id-, anterior Column -a me side I re Ilex arc), lateral coin i mi of same side, posterioi column of ide; J. collateral-, from fibers in the anterior and lateral funiculi,?;, collate
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