MUSCLES OF THE ABDOMEN 203 



that of the transversalis and passes entirely in front 

 of the rectus, forming the conjoined tendon of the 

 external oblique and transversalis. 



Nerves Ilio-lumbar and ilio-hypogastric. 

 TRANSVERSALIS. 



Origin Outer one-third of Poupart's ligament, two- 

 thirds of inner lip of crest of ilium, inner surfaces of 

 cartilages of the six lower ribs, interdigitating with 

 the fibres of the diaphragm, and from the lumbar 

 fascia connected with the spines of the lumbar 

 vertebrae. 



Insertion It passes transversely across the abdomen, 

 becomes aponeurotic, the aponeurosis being attached 

 to the linea alba ; it passes behind the sheath of the 

 rectus except for its lower one-fourth, where it joins 

 the aponeurosis of the internal oblique, forming the 

 conjoined tendon which passes down in front of 

 the rectus and is attached to the upper border of 

 the pubes. 



Nerves Ilio-inguinal and ilio-hypogastric. 

 RECTUS ABDOMINIS. 



Origin Passes from the ensiform cartilage to pubis. 

 Arises from cartilages of fifth, sixth, and seventh 

 ribs and ensiform cartilage. 



Insertion Passes downward, becoming narrower, and 

 is inserted on crest of pubis. This muscle shows 

 four or five transverse tendinous intersections. 



Nerve Ilio-hypogastric. 

 PYRAMIDALIS. 



Origin Superior border of pubis and anterior pubic 

 ligament. 



Insertion Passes upward in front of rectus, and is 

 inserted into linea alba below umbilicus. 



Nerve Ilio-inguinal. 



