Human anatomy, including structure and development and practical considerations . plane, but overlie one another tosome extent, so that each group occupies a crescentic area, whose greatest width cor-responds in a general way with that of the subjacent ventral horn of gray anterior root-line, which lies from 2-4 mm. lateral to the median fissure, isneither indicated by adistinct furrow nor con-tinuous. In this manner twolongitudinal tracts, theposterior columns(funiculi posteriores) aremarked off betweenthe posterior medianseptum and the sulciof the posterior root-lines. These colum
Human anatomy, including structure and development and practical considerations . plane, but overlie one another tosome extent, so that each group occupies a crescentic area, whose greatest width cor-responds in a general way with that of the subjacent ventral horn of gray anterior root-line, which lies from 2-4 mm. lateral to the median fissure, isneither indicated by adistinct furrow nor con-tinuous. In this manner twolongitudinal tracts, theposterior columns(funiculi posteriores) aremarked off betweenthe posterior medianseptum and the sulciof the posterior root-lines. These columnsinclude something lessthan one-third of thecircumference of thecord, and are about6 mm. in width in thethoracic cordand 7 mm. in the cervi-cal and lumbar enlarge-ments tracts included between the dorsal and ventral root-lines constitute the lateral columns (funiculilaterales) and those between the ventral root-lines and anterior median fissure are theanterior columns (funiculi anteriores). Such subdivision into anterior and lateral Fig. 884. Medulla. 4 cerv Ganglionon 4 nerve Dorsal nwts of s cerv. nerAe Upper end of spinal cord, viewed from behind after partial removal of duralsheath ; cord-segments are indicated by groups of converging bundles of posteriorroot-fibres; spinal ganglia are seen lying within the intervertebral foramina;spina! accessory nerve is seen ascending on each side. I028 HlMAX columns is, however, largely ariilicial, since neither sui«rficially nor internally is therea tlefinite deiiiarcation between these tracts. They may be, therefore, convenientlyregar^led as forming a common antcro-lateral column, that on each side embracessomething more than two-thirds of the semicircumference of the cord. In the lowercervical and upper thoracic cord, each posterior c<jlumn is subdivided bv a shallowfurrow that lies from mm. lateral to the posterior medium septum. This, theparamedian sulcus (sulcus intcrmcdius posterior;,
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
