. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. THE SPINAL CORD. 759 Structure.—ludependeiitly of the epithelium mentioned when describing the ependymis, neuroglia, nerve-fibres, nerve-cells, and vessels enter into the structm'e of the spinal cord. The neuroglia has l)eeu compared to a kind of sponge (the so-called spongy matter), in the spaces of which are the other elements of the cord. It exists in the white and the grey mattei^s, but it is more abundant in the superior grey cornna than in the inferior cornua. It surrounds the upper extremity of the former
. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. THE SPINAL CORD. 759 Structure.—ludependeiitly of the epithelium mentioned when describing the ependymis, neuroglia, nerve-fibres, nerve-cells, and vessels enter into the structm'e of the spinal cord. The neuroglia has l)eeu compared to a kind of sponge (the so-called spongy matter), in the spaces of which are the other elements of the cord. It exists in the white and the grey mattei^s, but it is more abundant in the superior grey cornna than in the inferior cornua. It surrounds the upper extremity of the former, in softer and more transparent, and is here designated the geUitinous substance of Rolando (substantia gelatinoso Eolandi). It constitutes,. TRANSVERSE StCTION OF SPINAL CORP THROLTiH THE MIDDLE OF THE LUMBAR REGION, SHOWING ON THE RIGHT SIDE THE COURSE OF THE NERVE-ROOTS, AND ON THE LEFT THE POSITION OF THE PRINCIPAL TRACTS OF VESICULAR 5IATTER. A, A, Inferior columns; p, p, superior columns; L, L, lateral columns; a, inferior median fissure; JO. superior median fissure; 6, 6, 6, b, inferior roots of spinal nerves: c, c, superior roots; d, d. tracts of vesicular matter in'supprior column ; e, traits of vesicular matter in inferior column f, central canal ; g, substantia gelatinosa. in great part, the grey commissure, and can be deeply stained by the carminate of ammonia. The neuroglia is associated with a small quantity of connective tissue, which entere the cord along with the vessels. It is formed of a mass of cells, the mem- regions either a depression on the surface of the cord, or oa its substance a fasciculus of connective tissue, or a vessel larger tlian in other points. The systematic lesions of the coid not having yet been observed in the domestic animals, it cannot he stated at what point the distinctions established in the human spinal cord are justified, 80 far as that of the Horse is concerned. In some sections of the cord of that animal, it would ap
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