268 



DISSECTION OF THE ABDOMEN. 



its direction, 



and parts in 

 contact with 

 it. 



Triangular 

 fascia. 



Dissection 

 to expose 

 internal 

 oblique. 



Clean the 

 cremaster. 



its base directed outwards, which is named Gimbernat's 

 (fig. 97 and 98). 



By its lower border Poupart's ligament joins the fascia lata of the 

 thigh; and so long as this membrane remains uncut, the band is 

 curved with its convexity downwards, especially when the limb is 

 extended on the trunk. The outer half of the ligament is oblique, 

 and is firmly united with the subjacent iliac fascia; its inner 

 half is placed over the vessels passing from the abdomen to the 

 thigh. 



Triangular fascia. From the insertion of Gimbernat's ligament into 



the pectineal line, some 

 fibres are directed upwards 

 and inwards to the linea 

 alba, where they blend with 

 the other tendons. As the 

 fibres ascend, they diverge 

 and form a thin sheet, to 

 which the above name has 

 been given (fig. 97). 



Dissection. The upper 

 part of the external oblique 

 is now to be taken away, on 

 both sides of the body, to 

 see the parts beneath. It 

 may be detached by carry- 

 ing the scalpel through the 

 digitations on the ribs back 

 to the free border, and then 

 through the insertion into 

 the iliac crest. The muscle 

 is to be thrown forwards as 

 far as practicable, after the 

 nerves crossing the iliac 



FIG. 99. THE PARTS BENEATH THE crest are dissected out ; but 

 EXTERNAL OBLIQUE MUSCLE. 



A. Internal oblique muscle. 



B. Latiss-imus clorsi, cut. 



c. Part of the hinder tendon of the 

 trans versalis muscle. 



D. Poupart's ligament. 



E. External, F, internal intercostals. 



in raising it care must be 

 taken not to detach the 

 rectus muscle from the ribs 

 above, nor to cut through 

 the tendon of the internal 

 oblique at the upper part. 

 By the removal of the fatty 



tissue the underlying internal oblique muscle, with some nerves 

 issuing through it below, will be exposed. 



At the lower border of the internal oblique, where it springs from 

 the deep surface of Poupart's ligament, it will be seen that the fibres 

 are prolonged down upon the spermatic cord. These fibres consti- 

 tute the cremaster muscle, and should be defined. They consist of 

 fleshy loops which descend through the external abdominal ring. 

 Internal to the cord they become tendinous, and are easily taken away. 



