MUSCLES OF THE ABDOMEN. 



81 



ment, into the cartilages of 4 lower ribs ; by its aponeurosis into the linea 

 alba; and leaving an arched border 20 over the spermatic cord, by the con- 

 joined tendon 19 with the transversalis into the pubic crest and the pectineal 

 line. Its aponeurosis splits at the rectus abdominis for its upper three- fourths, 

 one layer passing in front, the other behind that muscle, to unite again at the 

 linea alba; for its lower one-fourth it passes in front of the rectus. Action 

 and Nerves, same as the external oblique. 



FIG. 41. 



Transversalis, from the outer one-third of Poupart's ligament, the anterior 

 two-thirds of the inner lip of the crest of the ilium, the cartilages of 6 lower 

 ribs, and an aponeurosis from the spines and transverse processes of the 

 lumbar vertebrae, by its aponeurosis into the linea alba, and by the con- 

 joined tendon 19 with the internal oblique, into the pubic crest and the 

 pectineal line. Its aponeurosis passes behind the rectus abdominis for its 

 upper three-fourths, in front of that muscle for its lower one-fourth. 



