18 MUSCLES OF THE ABDOMEN 
curvature of the duodenum is the pancreas; its at- 
tachments must not be disturbed. 
b. THE SMALL INTESTINE is several feet in length, 
and forms a very much convoluted tube which is at- 
tached to the dorsal wall of the body by a membrane, 
the mesentery. Starting from the duodenum, follow 
the small intestine to its ending in the large intestine. 
c. THE MeEsENTERY 1s a double layer of the peri- 
toneum which is reflected from the dorsal wall of the 
abdomen, and encloses the stomach and _ intestines. 
Blood-vessels, nerves, and lymphatics pass to the in- 
testines between its two layers, 
d. THE C&cvumM is seen at the point where the small 
intestine passes into the large ; it 1sa coiled diverticu- 
lum of the intestine two or more inches in length. 
e. THE LARGE INTESTINE commences at the czecum. 
The first portion is known as the co/ox , it passes an- 
teriorly for a short distance as the ascending colon, 
then transversely, the ¢ransverse colon, and finally 
posteriorly as the descending colon, which is continued 
directly into 
f. THe Rectum. This is the terminal portion of the 
large intestine ; it lies within the pelvis, and opens 
to the exterior through the anus. 
ge, Pryer’s Patcues. At intervals along the lower 
portion of the small intestine, on the border oppo- 
site the attachment of the mesentery, a number of 
small oval bodies will be seen, the Peyer’s patches. 
They are masses of lymphoid tissue imbedded in 
the intestinal wall. 
h. LympH Gianps. Enclosed within the layers of 
the mesentery will be found a number of lymph glands, 
flattened oval bodies varying in size. Where the 
