. The comparative anatomy of the domesticated animals. Veterinary anatomy. TEK SPINAL CORD. 761 branous bodies of which, irregularly stellate, send numerous prolongations between the nerve-tubes and cells. (In the substantia gelatinosa on the superior surface of the cord is a network of fine fibrils, epithelial in its nature, and consisting of cuticiilar matter; this is known as the granular matter, or spongy horn-substance.) The fibres and cells form, with the neuroglia, the whole of the grey substance. The cells have a more or less large number of protoplasmic prolongations which ramify and
. The comparative anatomy of the domesticated animals. Veterinary anatomy. TEK SPINAL CORD. 761 branous bodies of which, irregularly stellate, send numerous prolongations between the nerve-tubes and cells. (In the substantia gelatinosa on the superior surface of the cord is a network of fine fibrils, epithelial in its nature, and consisting of cuticiilar matter; this is known as the granular matter, or spongy horn-substance.) The fibres and cells form, with the neuroglia, the whole of the grey substance. The cells have a more or less large number of protoplasmic prolongations which ramify and anastomose, or have a process—the prolongation of Deiters—which puts them in communication with a nerve-tube. They are more or less voluminous. The fibres of the grey substance are all very fine, and some have a sheath of myeline; the others are reduced to an axile filament. In the Horse, the cells are not universally distributed throughout this substance, but are collected in small masses Avhich form longitudinal columns. The largest are grouped in three small masses around the inferior cornu—one external, another internal, and the third at the extremity ; the latter is the most considerable. They are in relation with the motor roots of the nerves. Some are spread in the middle part of the grey substance, and principally opposite the point where the grey commissure joins the cornua. There they form Lochhart Clarke''s column. A small number are placed on the margin of the superior grey cornu, and these, as well as the cells of Clarke's column, receive radicular filaments from the spinal sensory nerves. Finally, some form an external column {column of Burdach) at the junction of the two cornua, whence emerges, above, the small nerve of Wrisberg. They are probably connected with the vaso-motor phenomena. The nerve-tubes (or tubules) affect longi- tudinal, transversal, oblique, and vertical direc- tions. They bring the cells of one lateral moiety of the medulla into communic
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