164 



Muscles of the Abdomen. 



218. The Broad Abdominal Muscles. 



M. obliquns aldominis externus sen ollique descendens. Orig. : Outer surface 

 of the seven or eight lower ribs. Insert. : External lip of the crest of the ilium 

 and into a broad aponeurosis which is attached at the Ligamentum Poupartii and 

 extends in front of it as fibrous sheath of the Rectus aldominis to the Linea alba. 

 In the aponeurosis, one inch external to the Symphisis pulis is a triangular 

 opening, th.e external abdominal ring. (Apertura externa canalis inguinalis.) 



M. obliquus abdotninis internus sen, oblique ascendens. Orig. : Middle lip 

 of the crest of the ilium, anterior superior spine, and outer half of Poupart's 

 ligament ; it ends in an aponeurosis which divides into two lamellae, of which the 

 one in front of the rectus is spread along the whole length of the abdominal 

 wall, while the posterior lamella only reaches to the Linea Douglasii. From the 

 lower border of this muscle and the Transversus aldominis bundles of muscle 

 fibres run in loops down to the spermatic cord Muscidus cremaster. 



