FASCLE AND MUSCLES. 



(intercolumnar fibres) arising from Poupart's ligament. The 

 outer edge (external pillar) joins the pubic spine and is contin- 

 uous with Poupart's ligament; the inner edge (internal pillar) 

 joins the pubic crest and symphysis. The pillars and inter- 

 columnar fibres are continuous with a thin sheath (intercol- 

 umnar or external spermatic fascia) enveloping the cord, or 

 round ligament, below the ring. Triangular fascia : This is a 

 triangular band of fibres from the aponeurosis, which passes 

 through the linea alba to the opposite side and there runs be- 

 hind the internal pillar to join the pubic crest and spine. [429] 



Obliquus Internus Abdominis (under the preceding). Ori- 

 gin; lumbar fascia; anterior half of iliac crest; outer half of 

 Poupart's ligament. Course; mostly upward and forward. 

 Insertion; last three ribs (highest fibres); seventh to ninth 

 costal cartilages, and linea alba from the ensiform cartilage 

 to the pubic symphysis, through its broad aponeurosis. Its 

 fibres, and those of the Trans versalis, from Poupart's ligament 

 unite in a band (conjoint tendon) , which passes in front of the 

 Rectus to the crest and spine of the os pubis, and the ileo- 

 pectineal line. [430] 



Gremaster. This consists of the lowest fibres of the pre- 

 ceding. Origin; lower border of Internal oblique; middle of 

 Poupart's ligament. Course; arching, as a thin sheet of loops, 

 over the cord and enveloping this and the testicle. Insertion ; 

 fascia; (uppermost fibres) pubic spine. In the female it is 

 chiefly fascial (cremasteric fascia). [431] 



Trans versalis (under the Internal oblique). Origin; under 

 surface of lower six costal cartilages, interdigitating with Dia- 

 phragm ; lumbar fascia; anterior half of inner lip of iliac crest; 

 outer third of Poupart's ligament. Course; mostly horizon- 

 tal. Insertion; pubic crest and spine, and ileo-pectineal line, 

 through the conjoint tendon (lower fibres); linea alba and 

 ensiform cartilage through its aponeurosis. [431] 



Pyramidalis Abdominis (inconstant). Origin; pubic crest 

 in front of Rectus. Insertion; linea alba. [431] 



[191] 



