. The comparative anatomy of the domesticated animals. Veterinary anatomy. TEE SPINAL CORD. 671 Fig. 320. in the inferior, and one in tlie superior grey cornu. The columns cor- respond to what Stilling has named the nuclei of the nerves. A fourth mass of cells, the superior vesicular column of Clarke, or dorsal nucleus of Stilling, is observed at the point where the grey com- missure joins the cornua. The nerve-tubes (or tubules) affect longitudinal, transversal, oblique, and vertical directions. They bring the cells of one lateral moiety of the medulla into communication with : 1, The tubes o
. The comparative anatomy of the domesticated animals. Veterinary anatomy. TEE SPINAL CORD. 671 Fig. 320. in the inferior, and one in tlie superior grey cornu. The columns cor- respond to what Stilling has named the nuclei of the nerves. A fourth mass of cells, the superior vesicular column of Clarke, or dorsal nucleus of Stilling, is observed at the point where the grey com- missure joins the cornua. The nerve-tubes (or tubules) affect longitudinal, transversal, oblique, and vertical directions. They bring the cells of one lateral moiety of the medulla into communication with : 1, The tubes of the white substance; 2, Each other; 3, The cells of the opposite moiety, by passing into the commissures; 4l, The tubes of the white substance of the op- posite moiety, by following the same course. The neuroglia and nerve-tubes consti- tute the white substance, which is decom- posed, as we know, into three cords. All the tubes of this substance do not ascend to the brain, as was believed for a long time; the opinion that the tubes of the spinal nerves formed the medulla and extended to the brain, has been abandoned since Volk- mann measured, comparatively, the section of all these nerves and that of the nervous spinal-axis. (Volkmann has established the fact, that the size of the medulla corresponds with the number of nerve-tubes given off at any point. He gives the weight of four segments, each 2jQ inches in length, from the spinal cord of the Horse, and the relative extent of the •grey matter in square lines; these are as follows Area Area Grains, of Grey of White Matter. Matter. From below 2nd Spinal Nerve, 219 13 109 8th „ „ 293 28 142 „ „ 19th „ „ 163 11 89 „ 30th „ „ 281 25 121) In the white substance the tubes are lon- gitudinal, oblique, or transversal; the latter arise from the cells of the grey substance, and represent the roots of the nerves emerging either by the superior or inferior collateral fissure. The tubes of the anterior cords pass to.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectveterinaryanatomy
