The Abdominal Wall. 115 



oblique, and separated from its fellow of the opposite side 

 by the linea alba. 



The artery passing forward, for the most part in this muscle, is the 

 inferior epigastric, a branch of the external iliac (p. 134). It anastomoses 

 with the internal mammary (p. 174). It gives off the external spermatic 

 artery, a small vessel which perforates the abdominal' wall and extends 

 backward, supplying the sac of the testis in the male and ending in the 

 female in the wall of the vulva. An abdominal branch of this vessel 

 passes forward on the abdominal wall as described above. 



5. Divide the remaining portion of the wall on the left side, and its 

 whole thickness on the right, by a transverse incision, so that the viscera 

 are fully exposed. Note on the internal surface of the wall the smooth 

 serous investment here forming the parietal peritoneum (peritonaeum 

 parietale). 



