ABDOMEN. 



249 



peritoneum, the urachus in the mid-line extending from the summit of bladder to 

 the umbilicus. This is the foetal remains of the stalk of theallantois ; it is covered 

 by peritoneum, and the particular name given the ridge or fold in this peritoneum 

 is plica urachi. This opening sometimes fails to close. 



3. You saw on each side of the plica urachi the foetal remains of the hypo- 

 gastric arteries ; these are covered by peritoneum, called plica hypogastrica. 

 The triangular depression between these two plicae just noticed is the internal 

 inguinal fossa, and is associated with direct inguinal hernia. 



4. You located the deep epigastric artery and veins. To the inner side of this 



THYROID 



LUNG 



LIVER 

 Suspensory ligament 



SMALL INTESTINE 



BLADDER 



LUNG 



RIGHT AURICLE 



RIGHT VENTRICLE 



STOMACH 



PART OF TRANSVERSE 

 COLON 



Hypogastric artery 



FIG. 176. THE VISCERA OF THE FCETUS. (Rudinger.) 



artery you saw the middle inguinal fossa, associated with direct inguinal hernia ; 

 to the outer side the external inguinal fossa, associated (i) with the beginning of 

 the spermatic cord ; (2) with indirect or oblique inguinal hernia. You saw also 

 that this deep, epigastric artery forms the outer boundary of Hesselbach's tri- 

 angle. 



5. You saw the femoral sheath, containing the femoral artery, vein, and femoral 

 canal. These structures you saw leaving the pelvis below Poupart's ligament. 

 The peritoneal depression corresponding to the beginning of the femoral canal 

 the femoral ring is the femoral fossa, and is associated with femoral hernia. 

 17 



