Chap. VIIIJ 



SUMMARY 



139 



Consist of 



Modifications 



Function 



Definition 



Structure 



Classification 



I 



4. Muscularis mucosae — thin layer of muscular 

 tissue. 



Ruga. - temporary folds { ^^^^^^^^'^ 



Valvulse coniiiventes — permanent folds of mucous 

 membrane found in small 

 intestine. 

 Papillae — conical processes of mucous membrane 

 best seen on tongue. Contain blood- 

 vessels and nerves. 

 Villi — tiny thread-like projections of the mucous 



membrane of small intestine. 

 Cilia — hair-like processes. 

 r Inside skin. 

 Protection < Secretion of mucus. 



I Action of cilia. 

 Support — for network of blood-vessels. 

 Absorption — • Various modifications increase the 

 surface. 



Glands are organs that form secretions. 



A single cell, or many cells arranged in various ways. 

 Epithehal cells. 

 A Uberal blood-supply. 

 Intimate connection with 



nervous system. 

 Tubular — ■ tube shape. 

 Saccular — sac shape. 

 Convoluted tub ular — Ion g 

 tube coiled upon itself. 

 f Compound tubular — many 

 2. Compound — wa?i?/ tubes. 



I Racemose — many sacs. 

 no duct 



\ Essentials 



1. Simple — one duct 



ducts 

 3. Ductless 



Definition — 



the glands 



Classification 



Secretions are substances elaborated from the blood by 

 They are intended to perform some office in the body. 

 External secretions — are substances formed by the 

 simple and compound glands and discharged by 

 means of a duct. 

 Internal secretions — are substances formed by any 

 kind of gland and discharged into the blood or 

 lymph. 

 External secretions — studied later. 



f Essential to metabolism. 

 1 Stimulate by means of hormones. 

 Excretion — a secretion which is ehminated. 



Function 



Internal secretions 



