THE INTESTINES. 433 
four inches from the commencement it receives the name of jejunum, 
which it retains until within the same distance of its termination, when 
it becomes ileum: but in the French school it is divided only into the fixed 
portion or duodenum, and the loose or floating portion, comprehending 
what is here called the jejunum and ileum. In this course it receives 
the biliary and pancreatic fluids; the duct from the liver, and that from 
the pancreas, opening together into the duodenum, six or seven inches 
from the pylorus. At its termination in the ccecum there is a valve, 
Fic. 4.—THe LARGE AND SMALL INTESTINES, DETACHED, 
The duodenum, with its cul de sac removed. 6. 6. Commencement of colon. 
2. 
ule 
2, 2, 2. 2, 2.2. The convolutions of the jejunum 7. 7. Transverse colon. 
and ileum. 8. Terminal portion of colon. 
3. 3. The mesentery. 9. Rectum. 
4, The apex of the cecum. a. a. Muscular bands of colon, 
5. Its body. 
called ileo cecal, which prevents the return of the contents of the ceecu:n 
into the ileum, 
THE LARGE INTESTINES, as their name implies, are of much greater 
diameter than the small ; but they are not above one-third of their length. 
Instead of being convoluted, they are puckered into pouches by a peculiar 
arrangement of the longitudinal muscular fibres, which are collected into 
bundles or cords (a a, Fig. 4), and, being shorter than the intestine, gather 
it up into cells, The mucous membrane also has very few villi, which 
* Fr 
