THE GLANDULAR TISSUE. 11T 



For further details of the sympathetic, turn to the 

 nerves of the Trunk, as connected with the several viscera, 

 particularly those of the abdomen. 



CHAPTEK V. 



* JT 

 THE GLANDULAR TISSUE. 



ANALYSIS. 

 DEFINITION, DIVISION, FORM. 



GLANDS are organs designed to separate from the blood 

 fluids of a peculiar kind, some of which are concerned in 

 important functions, and again re-enter the system, while 

 others are ejected from the body as not only useless, but 

 highly dangerous to be retained. 



This definition only applies to those glands having ex- 

 cretory ducts, which in reality are considered as the only 

 true and proper glands, the others being more properly 

 called ganglia. 



The glands may be arranged under two divisions, 



1. Those having excretory ducts. 



2. Those without excretory ducts. 



Under the first head we have the salivary glands, the 

 liver, the pancreas, the kidneys, the testicles, the mammae, 

 the multitude of mucous glands scattered throughout the 

 alimentary tube, and the equally great number belong- 

 ing to the skin. Under the second division we find the 

 lymphatic glands, the thymus, the thyroid, capsulae renales, 

 glandulee Pacchioni, and the pineal gland. 



Structure. The simplest form of a gland is the sac or 

 cell follicle, as, for instance, the mucous follicles which 

 consist of a simple depression of mucous membrane, con- 

 tracted at its orifice into a narrow neck. A second form is 

 that of the tube, also composed of a reflection of the mem- 

 brane. By the combination of these two forms, says Pro- 

 fessor Muller, all the varied glands in the human body, as 

 well as in inferior animals, can be constructed. 



