NEURECTOMY OF THE MEDIAN AND OF THE ULNAR NERVES. 



95 



In performing this operation the horse is cast on the sound side. 

 The affected limb is left in the hobbles, but drawn tense by means of 

 two strips of webbing, one fixed on the upper portion of the canon- 

 bone being pulled backwards, the other, attached to the coronet, in a 

 forward direction. Two assistants, holding the free ends, keep the 

 parts steady. 



The operator kneels in front of the upper part of the forearm ; the 

 point selected is four to six inches above the knee. 



The parts having been prepared, my colleague M. Almy made, at 

 the point just indicated, an incision about one inch and a quarter to 



Figs, ii and 12. — Neurectomy of the ulnar nerve. F E, flexor metacarpi externus ; F O, 

 flexor metacarpi obliquus ; N, ulnar nerve ; A V, ulnar artery and nerve. 



one inch and a half long through the skin. He then divided the sub- 

 cutaneous connective tissue, the antibrachial aponeurosis, and the 

 fascia which unites the aponeurotic covering of the two muscles. 



With forceps and bistoury he dissected away the connective tissue 

 surrounding the nerve, following the direction of the wound, and care- 

 fully avoiding injury to the ulnar artery and vein which accompany the 

 nerve. 



Having isolated the nerve, he divided it at the upper angle of the 

 wound, and excised a fragment about one inch and a quarter in length. 



