A text-book of physiology for medical students and physicians . * From the results of comparative studies of the differentvertebrates we may conclude that the long tracts are a relativelylate development in their phylogenetic history, and that in themost highly developed animals, man and the anthropoid apes, * Sherrington and Laslett, Journal of Physiology, 29, 188, 1903; andSherrington, ibid., 14, 255. 168 PHYSIOLOGY OF CENTRAL NERVOUS SYSTEM. these long tracts are more conspicuous and form a larger per-centage of the total area of the cord. A physiological corollaryof this conclusion should
A text-book of physiology for medical students and physicians . * From the results of comparative studies of the differentvertebrates we may conclude that the long tracts are a relativelylate development in their phylogenetic history, and that in themost highly developed animals, man and the anthropoid apes, * Sherrington and Laslett, Journal of Physiology, 29, 188, 1903; andSherrington, ibid., 14, 255. 168 PHYSIOLOGY OF CENTRAL NERVOUS SYSTEM. these long tracts are more conspicuous and form a larger per-centage of the total area of the cord. A physiological corollaryof this conclusion should be that in man the independent activityof the cord is less marked than in the lower vertebrates, andthis deduction is borne out by facts (see p. 147). Specific Designation of the Long Spinal Tracts.—The tractsthat are most satisfactorily determined for the human spinal cordare indicated schematically in Fig. 75. They are named as follows: In the posterior funiculus, 1. The fasciculus gracilis (column of Goll). 2. The fasciculus cuneatus (column of Burdach).. Fig. 75.—Schema of the tracts in the spinal cord (Kolliker) : g, Fasciculus gracilis;b, fasciculus cuneatus ; pc, fasciculus cerebrospinalis lateralis ; pd, fasciculus cerebrospinalisanterior; /, fasciculus cerebellospinalis ; gr, fasciculus anterolateralis superficialis. In the lateral funiculus, 1. The fasciculus cerebrospinalis lateralis, known also as thelateral or crossed pyramidal tract. 2. The fasciculus cerebellospinalis, known also as Flechsigstract. 3. The fasciculus anterolateralis superficialis, known ;dso asGowers tract. 4. The lateral ground bundle (fasciculus lateralis proprius),made up chiefly of short association fibers. In the anterior funiculus, 1. The fasciculus cerebrospinalis anterior, known also as thedirect or anterior pyramidal tract. 2. The anterior ground bundle (fasciculus anterior proprius). SPINAL COED AS A PATH OF CONDUCTION, 169 Of these tracts, the fasciculus gracilis, fasciculus cuneatu
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