LKSSKR SAC OF THE PERITONEUM 



245 



inesoduodenum 



trans, colon 



- */>leen 



mesocolon 

 asc. colon 



vermiform 

 appendix 



tUelline stalk - 



mesogastrium 

 ('Treat omentum) 



- duodeno-jejunal 

 flexure 



tlesc. colon 

 mesocolon 



FIG. 301. DEVELOPMENT OF THE MESENTERY IN THE HUMAN EMBRYO, SEMI-DIAGRAMMATIC. 



(From Kollmann.) 

 The arrow points to the foramen of Winslow. 



A B 



creas. 



(ftlzntestme. 



FIG. 802. DIAGRAMS ILLUSTRATING THE DEVELOPMENT OP THE GREAT OMENTUM. (O. Hertwig.) 



A, earlier stage. B, later stage. 



st, stomach; s.o., small omentum; s'.o'., omental sac; o', mesogastrium, springing from the posterior 

 wall of the abdomen, near which in A it encloses the pancreas ; o' 1 , attachment of mesogastrium to 

 greater curvature of stomach ; o 3 , fold of mesogastrium or great omentum growing over coils of small 

 intestine ; me, mesentery ; m.c., transverse mesocolon ; o 4 (in B), dotted line showing the situation of that 

 lamella of the mesogastrium which at first assisted in enclosing the pancreas, but which has now 

 disappeared. The next part of this lamella has coalesced with the adjacent lamella of the transverse 

 mesocolon, and has also disappeared. The coalescence is indicated by the black line. 



