. A text-book of physiology : for medical students and physicians . Z1^- Lumbar. Fig. 77.—Diagrams toshow course of upward de-generation of fibers of poste-rior funiculi after section ofa number of posterior rootsof the nerves forming thelumbosacral plexus.—(Mott.)It will be noted that in thecervical regions the degener-ated area is confined to thefasciculus gracilis. from tract cells in the gray matter of thecord itself. It is convenient to speakof the former group as exogenous fibers,using this term to designate nerve fiberswhich arise from cells placed outsidethe cord; and the latter group
. A text-book of physiology : for medical students and physicians . Z1^- Lumbar. Fig. 77.—Diagrams toshow course of upward de-generation of fibers of poste-rior funiculi after section ofa number of posterior rootsof the nerves forming thelumbosacral plexus.—(Mott.)It will be noted that in thecervical regions the degener-ated area is confined to thefasciculus gracilis. from tract cells in the gray matter of thecord itself. It is convenient to speakof the former group as exogenous fibers,using this term to designate nerve fiberswhich arise from cells placed outsidethe cord; and the latter group as endo-genous fibers—that is, fibers that havetheir cells of origin in the gray matter ofthe cord. If we omit a considerationof their collaterals the course of theexogenous fibers is easily come into the cord at every pos-terior root, enter into the fasciculuscuneatus, and pass upward. The fibersof this kind that enter at the lowerregions, sacral and lumbar, are, however,gradually pushed toward the medianline by the exogenous fibers entering athigher le
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