494 
peritoneal cavity. Loop 6 and the caecum are still within the cord. 
This specinem therefore shows that the upper part of the small intestine 
is the first to return to the peritoneal cavity and that the caecum is 
the last. 
Fig. 1. Reconstruction of the intestine of embryo LXXIX, Enlarged 7 times, The 
Arabic figures mark the parts which correspond with those in the earlier publication. D dia- 
phragm; 12 twelfth dorsal vertebra, 
A further comparison of this model with No. XXXIV‘) shows 
that as the upper part of the small intestine moves into the peritoneal 
cavity it shifts to the left hypochondriac region and that the lower 
part of the small intestine with the caecum shifts to the right hypo- 
chondriac region. With this movement the different portions of the 
large intestine are marked off; the large intestine being dragged to 
the left side has its mesentery elongated at the same time making 
the S-flexure in the colon; the original bend of the colon below the 
stomach marks the union of the transverse with the descending colon. 
1) See His’ Archiv, Supplementband, Tafel XXIV. 
