. The human body and health : an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools . al colon and rectum are the main parts of the largeintestine. Vermiform Appendix. — The vermiform appendix is ablind tube projecting from the large intestine. It is aslarge around as a lead pencil and from one to six inches inlength. Its cavity is scarcely larger in diameter than thehead of a pin, so that it sometimes becomes clogged up Fig. 54. — The small intestine joining thelarge one. ap, vermiform appendix; c,beginning of the large intestine; co,col
. The human body and health : an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools . al colon and rectum are the main parts of the largeintestine. Vermiform Appendix. — The vermiform appendix is ablind tube projecting from the large intestine. It is aslarge around as a lead pencil and from one to six inches inlength. Its cavity is scarcely larger in diameter than thehead of a pin, so that it sometimes becomes clogged up Fig. 54. — The small intestine joining thelarge one. ap, vermiform appendix; c,beginning of the large intestine; co,colon; sm, small intestine. THE NATFllE OF A GLAND 85 with material from tlie intestine. This may cause a veryrapid growth of the bacteria present, and as a result theorgan becomes inflamed and often must be removed toprevent the bacteria from eating through into the abdomi-nal cavity. This inflammation of the appendix is calledappendieitis. The appendix has no function in man at present, butmillions of years agoit was wider andlonger, and then wasof service in diges-tion, as is the casenow in the rabbit,groundhog, and GLANDS OF DIGES-TION The Nature of aGland. — A gland isa simple tube linedwith cylindricalcells, or a collectionof such tubes, all Fig. 55. — Diagram of a gland, c, alveolus,01 WlllCn may be or enlarged end of tube; i, common duct to branches of the onemain tube called a carry off the secretion made by the cells fromthat part of the blood passing through thewalls of the capillaries; a, arteries; v, veins. duct. The purpose of a gland is to manufacture some special material fromthe blood. The thousands of gastric glands in the wallsof the stomach and the intestinal glands of the intestinesare simple or slightly branched tubes too small to adaiit 86 THE DIGESTIVE SYSTEM a hair. Nearly all mucous membrane contains in it glands for secreting mucus with which to moisten the surface and prevent the entrance of germs. Salivary Glands. — Three pairs of very
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