. Anatomy, descriptive and applied. Anatomy. THE SPINAL CORD 835 Another tract, usually described as belonging to the lateral column, but functionally more intimately related to the sensor neurone system of the dorsai column is the fasciculus marginalis (of Spitzka and Lissauer, described on page 836). The great majority of the axones constituting the dorsal column are the afferent (sensor) axones arising from the spinal ganglion cells, entering the cord by the dorsal roots. These dorsal root axones bifm'cate in the region of the dorsal horn, one branch ascending a little obliquely at first, t
. Anatomy, descriptive and applied. Anatomy. THE SPINAL CORD 835 Another tract, usually described as belonging to the lateral column, but functionally more intimately related to the sensor neurone system of the dorsai column is the fasciculus marginalis (of Spitzka and Lissauer, described on page 836). The great majority of the axones constituting the dorsal column are the afferent (sensor) axones arising from the spinal ganglion cells, entering the cord by the dorsal roots. These dorsal root axones bifm'cate in the region of the dorsal horn, one branch ascending a little obliquely at first, then vertically, while the other branch takes a similar downward course for a shorter distance (Fig. 613). As additional groups of fibres are contributed by each successive dorsal nerve root the mass of white substance in the dorsal column accumulates as the cord is ascended, though it must be noted that not all of these afferent fibres traverse the whole of the cord above, but end in relation with cells in the gray substance at various levels. The succes- sive accessions of afferent fibres are disposed in a laminated manner so that the lumbar fibres come to lie laterad of the sacral bundle, the thoracic laterad of the lumbar, and so on as the cord is ascended. A section of the cord at its highest level would therefore traverse a collection of bundles derived from all of the dorsal nei-ve roots of the cord, arranged as shown in Fig. 611. In the upper segments of the cord it is possible to distinguish a division of the dorsal column into two principal fasciculi owing to the presence of a distinct connective-tissue septum which passes into the substance of the dorsal column along the dorsoparamedian groove. These fasciculi are termed the fasciculus gracilis, or Goll's column, and the fasciculus cuneatus, or Burdach's column; in the consideration of the external morphology of the cord, these have already been referred to as the funiculus gracilis and funiculus cuneatus, respec- tiv
Size: 859px × 2909px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
