. Diseases of the dog and their treatment. tension of thesuppurating process through an orifice of the vertebra, and occasionally 244 DISEASES OF THE NERVOUS SYSTEM you see it originate, in connection with some infectious or toxic disease(distemper, rabies, pyaemia) due to the specific toxic material locatingin the cord. It may also be caused by cold, being continually wet andfrozen, as in retrievers. Pathological Anatomy.—The inflamed pia mater appears thickened,infiltrated, and may be injected in some places and, as a rule, adherent tothe vertebra, due to the organization of the exudation. I
. Diseases of the dog and their treatment. tension of thesuppurating process through an orifice of the vertebra, and occasionally 244 DISEASES OF THE NERVOUS SYSTEM you see it originate, in connection with some infectious or toxic disease(distemper, rabies, pyaemia) due to the specific toxic material locatingin the cord. It may also be caused by cold, being continually wet andfrozen, as in retrievers. Pathological Anatomy.—The inflamed pia mater appears thickened,infiltrated, and may be injected in some places and, as a rule, adherent tothe vertebra, due to the organization of the exudation. It is coveredon its upper surface by a serous, fibrinous, or purulent exudation. Thearachnoid exudation is covered by a milky, false membrane and greatlythickened. The dura mater is rarely involved, but when such is the caseit becomes thickened and loosened and covered with a thin serum. Thespine itself shows the inflammatory process either extended over large sur-faces or else confined to small centres. In the early part of the disease,. Fig. 94.—Paralysis of the posterior extremities. the cord is slightly swollen; the gray substance is somewhat reddened,dark and soft. Later the cord becomes a yellowish-red, breaks down andundergoes white, yellow, or red degeneration. In the chronic course ofthe disease we see atrophy of the nerves as a conscc{uence of nuilforma-tions of the connective tissue. Clinical Symptoms.—As a rule the symptoms of alteration of the spinalcord appear gradually and become more intense as the disease the disease is due to violent traumatisms, producing a directdestruction or laceration of the nervous centres, or pressure, caused byhemorrhage and blood l)eing discharg(Ml and pressing upon the spine thesymptoms are immediately seen or appear in a very short time. In alldiseases of the spinal cord it is very inij)ortant to recognize the fact thatconsciousness is rarely affected. We will take up all these symptoms in INFLAMMATION OF THE S
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