DISEASES OF THE HOESE. 215 



over an embankment, or a violent fall upon the haunches ma}- produce 

 it. Concussion may be followed by partial paralysis or spinal hem- 

 orrhage; generally, however, it is confined to a jarring and some dis- 

 turbance of the nerve elements of the cord, and the paralj'tic effect 

 which ensues soon passes off. Treatment consists in rest until the 

 animal has completely recovered from the shock. If secondary effects 

 follow from hemorrhage or compression, the}" have to be treated as 

 heretofore directed. 



SPIXAL TUMORS. 



Within the substance of the cord glioma or the mixed gliosarcomata 

 are found to be the most frequent, tumors maj'- form from the meninges 

 and the vertebra, being of a fibrous or bony nature, and affect the 

 spinal cord indirectly b}- compression. In the meninges w^e may find 

 glioma, cancers, and psammoma, fibromata; and aneurisms of the spinal 

 arteries have been discovered in the spinal canal. 



Symptoms. — Tumors of the spinal canal cause symptoms of spinal 

 irritation or compression of the cord. The gradual and slow develop- 

 ment of symptoms of paralysis of one or both hind limbs or certain 

 muscles may lead to a suspicion of spinal tumors. The paralysis 

 induced is progressive, but not usuall}" marked with atroph}^ of the 

 muscles or increased sensibilit}- along the spine. When the tumor is 

 within the spinal cord itself all the symptoms of myelitis may be present. 



Treatment. — General tonics and 1-dram doses of nux vomica may be 

 giv^en; iodide of iron or iodide of potassa in 1-dram doses, three times 

 a day in feed, may, in a very few cases, give some temporary benefit. 

 Usually the disease progresses steadil}" luitil it proves fatal. 



XEURITIS, OR INFLAMMATION OF A NERVE. 



This is caused b}' a bruise or wound of a nerve or by strangulation 

 in a ligature when the nerve is included in the ligation of an artery. 

 The changes in an inflamed nerve are an enlargement, reddening of the 

 nerve sheath, spots of extravasated blood, and sometimes an infiltration 

 of serum mixed with pus. 



Symj)toms. — Acute pain of the parts supplied by the nerve and 

 absence of swelling or increased heat of the part. 



Treatment. — H3qoodermic injections of from 3 to 5 grains of morphia 

 to relieve pain, hot fomentations, and rest. If it is due to an inclusion 

 of a ligature, the nerve should be divided above and below the ligature. 



NEUROMA, OR TUMOR OF A NERVE. 



Neuroma may be from enlargement of the end of a divided nerve or 

 due to fibrous degeneration of a nerve which has been bruised or 

 wounded. Its most frequent occurrence is found after the operation 

 of neurotomy for foot lameness, and it maj- appear after the lapse of 



