OF THE A B DOMEX 



427 



That portion of the aponeurosis which extends between the anterior superior 

 spine of the ilium and the spine of the os pubis is a broad band, folded inward, 

 and continuous below with the fascia lata; it is called Poupart's ligament. The 

 inner half inch of this ligament is reflected and attached to the subjacent pec|jjje;il 

 ine. This reflected part is called Gimbernat's ligament. 



In the aponeurosis of the External oblique, immediately above the crest of the 

 )s pubis, is a triangular opening, the external abdominal ring, formed by a separa- 

 tion of the fibres of the aponeurosis in this situation. 



POUPART'S 

 LIGAMENT 



INTERCOLUMNAR 

 FIBRES 



EXTERNAL 

 'ABDOMINAI 

 RING 



LONG 



INDUS 

 VEIN 



FIG. 320. Right external abdominal ring and saphenous opening in the male. (Spalteholz.) 



Relations. By its superficial surface, the External oblique muscle is in relation with the 

 iperficial fascia, superficial epigastric and circumflex iliac vessels, and some cutaneous nerves; 

 j its deep surface, with the Internal oblique, the lower part of the eight inferior ribs, and 

 itercostal muscles, the Cremaster, the spermatic cord in the male, and round ligament in the 

 male. Its posterior border, extending from the last rib to the crest of the ilium, is fleshy 

 roughout and free; it is occasionally overlapped by the Latissimus dorsi, though generally a 

 iangular interval exists between the two muscles near the crest of the ilium, in which is seen 

 portion of the Internal oblique. This triangle, Petit's triangle (trigonum lumbale] is there- 

 re bounded in front by the External oblique, behind by the Latissimus dorsi, below by the 

 est of the ilium, and its floor is formed by the Internal oblique muscle (Fig. 319). 



The following parts of the aponeurosis of the External oblique muscle require 

 be further described: 



External Abdominal Ring. Intercolumnar Fibres and Fascia. 



Poupart's Ligament. Gimbernat's Ligament. 



Triangular Fascia of the Abdomen. 



The External Abdominal Ring (annulus inguinalis subcutaneous) (Figs. 320 and 

 23). Just above and to the outer side of the crest of the os pubis an interval 

 nown as the external abdominal ring is seen in the aponeurosis of the External 



