CRYPTORCHID CASTRATION. 219 



hay, but no straw. On the morning of operation the bowel is 

 emptied by a subcutaneous injection of arecolin. Clysters are contra- 

 indicated. 



Thus prepared, the horse is cast on the side opposite the seat of 

 operation : the hind quarters are half rolled over, and lie somewhat 



o. 



\ 



\ 



i.e. i.e. 

 o.c. 



m 



Fig. 247.— Inguinal canal, viewed from the flank. The external lip of 

 the left inguinal ring has been removed. The aponeurosis of the 

 external oblique abdominal muscle has been cut through a little in 

 front of the spot where it divides. The inner oblique abdominal muscle 

 has been separated from Poupart's ligament to a point near the inner 

 commissure of the inguinal canal. 



p. Poupart's ligament o.a.i. Obliquus abdominis internus muscle, 

 i.c.i.c. Inner commissure of the inguinal canal, a.o.a.e. Aponeurosis of 

 the obliquus abdominis externus muscle divided and reflected, i.e. 

 Inner commissure of the lower abdominal ring. o.c. Outer commissure, 

 divided, a.l. Anterior lip. p.l. Posterior lip. u.a.k. The dotted line 

 indicates the position of the upper abdominal ring. o. The dotted 

 line indicates the position in which the opening is made in operating 

 for abdominal cryptorchidism. H. Hind limb, adducted. 



higher than the fore. The upper hind foot is then drawn forward 

 and fixed in position of abduction and flexion, as in ordinary 

 castration. By previously cleansing the hoofs and lower part of 

 the limbs and surrounding them with moist cloths, and by moistening 

 the hair on the upper part of the thigh the seat of operation is 

 protected against dusj; or infection from these parts. 



