A 1ST D PHYSIOLOGY. 



181 



Fig. 113. 



denum, because in length it is equal to the breadth of twelve 

 fingers. It commences with the pyloric orifice on the right 

 extremity of the stomach, and runs slightly backwards and 

 upwards until it terminates in the Jejunum. It is often 

 called the second stomach, because a certain part of digestion 

 takes place here, and the food passes slowly and receives no 

 less than three different secretions : one from the Liver, an- 

 other from the Pancreas, and the third from the Mucous 

 membrane of the intestine itself. 



296. Jejunum.' — Next below the Duodenum is the Jeju- 

 num, meaning " empty," since it is always found in this con- 

 dition after death. This, like the other divisions of the intes- 

 tine, has three coats, and is of a slightly pinkish color, be- 

 cause here the mucous membrane is thicker than in any other 

 of the intestines. 



297. Ileum — The Ileum 

 (from the Greek signifying 

 to twist) is the third division 

 of the Intestines, and is about 

 fifteen feet in length. It is 

 the smallest Intestine, and has 

 a darker color than either of 

 those already mentioned, and 

 is exceedingly tortuous in its 

 course. 



298. Crccum.— The fourth 

 division of the Intestine is 

 the Caecum. This is a shut 



The Caecum and its Appendix. 1, Cae- 

 SaC mUCh larger than the <?um. 2, Colon. 3, Ileum. 4, Entrance 



small Intestine, and of a ^^u^^^J^ 



What do they secrete ? What vessels open into the stomach, and of what service are 

 they? 295. What is the Duodenum ? Give its general course. Why is it sometimes 

 called the second stomach? What fluids are poured into it? 296. What is the namo 

 Jejunum derived from? What is its color? 297. How long is the Ileum? What is 

 Baid of its shape? 293. Name the fourth divison of the intestines. Describe it. 



