960 



THE ORGANS OF DIGESTION. 



pelvis. Here the highest plane is subcostal, passing just under the lowest margin 

 of the thorax in a line drawn through the cartilaginous ends of the tenth ribs. 

 The lower plane is interspinous and passes through the anterior superior spines 

 of the ilia (Fig. 577). 



This marks off three zones or regions : 1. Epigastric. 2. Mesogastric. 3. 

 Hypogastric. Each one is again subdivided into three parts by the two sagittal 

 planes which pass through on either side the ileo-pectineal eminence and end on 

 the horizontal line connecting the tenth ribs (Fig- 578). 



Fio. 577. Outline of the ab- 

 dominal cavity as seen in mesial 

 section. The planes of subdivis- 

 ion are indicated by dotted lines. 

 (Cunningham.) 



Emincntia, ilia-peclinea, 

 FIG. 578. Regions of the abdominal cavity. Anterior view. (Joessel. 



The epigastric zone contains, in order, the riff Tit hypochondrium (UTTO, under ; 

 fcovdpot, cartilages), epigastrium (rci, upon ; yaarrjp, stomach) and the left hypo- 

 chondrium. The mesogastric zone contains the right lumbar, the umbilical, and 

 the left lumbar regions (the lateral regions may be called lateral abdominal). 

 The hypogastric zone contains the right iliac, the pubic, and left iliac regions. 

 Sometimes the iliac regions are called inguinal ; then a subinguinal region is dis- 

 tinguished below Poupart's ligament. 



The limits of the epigastric zone are the diaphragm above and below the 

 horizontal plane through the anterior ends of the tenth ribs. The lateral and 

 posterior limits follow the eleventh and twelfth ribs to end with the last on the 



