360 THE MUSCLES AND FASCIA 



lateral expansion from the lower attachment of the linea alba (adminiculum linene 

 albse). 



Dissection. Detach the External oblique by dividing it across, just in front of its attach- 

 ment to the ribs, as far as its posterior border, and separate it below from the crest of the ilium 

 as far as the anterior superior spine; then separate the muscle carefully from the Internal 

 oblique, which lies beneath, and turn it toward the opposite side. 



The Internal or Ascending oblique muscle (Fig. 219), thinner and smaller 

 than the preceding, beneath which it lies, is of an irregularly quadrilateral form, 



Conjoined tendon. 



CREMASTER. 



// 



Piibes. 



FIG. 219. The internal oblique muscle. 



and situated at the side and fore part of the abdomen. It arises, by fleshy fibres, 

 from the outer half of Poupart's ligament, being attached to the groove on its 

 upper surface ; from the anterior two-thirds of the middle lip of the crest of the 

 ilium, and from the posterior lamella of the lumbar fascia. From this origin the 

 fibres diverge : those from Poupart's ligament, few in number and paler in color 

 than the rest, arch downward and inward. across the spermatic cord in the male and 

 the round ligament in the female, and, becoming tendinous, are inserted, conjointly 

 with those of the Transversalis, into the crest of the os pubis and pectineal line, to the 

 extent of half an inch, forming what is known as the conjoined tendon of the In- 

 ternal oblique and Transversalis ; those from the anterior third of the iliac origin 

 are horizontal in their direction, and, becoming tendinous along the lower fourth of 

 the linea semilunaris, pass in front of the Rectus muscle to be inserted into the 

 linea alba; those which arise from the middle third of the origin from the crest of 

 the ilium pass obliquely upward and inward, arid terminate in an aponeurosis 



