GLAND TISSUE. 1 37 



ing the excretory duct. Its cell covering is not rarely different 

 from that of the acini. 



The walLof the excretory canal is here of a connective-tis- 

 sue nature. In larger, and the largest glands of a similar 

 structure, the omitted duct acquires an increasing complica- 

 tion. We shall later return to the particulars. 



Let us now take a cursory survey of the different glands 

 of the human body. 



a. To the tubular group belong : the Bowman's glands in 

 the regio olfactoria of the organ of smell ; the tubes of the 

 mucous membrane of the stomach, small and large intestine, 

 which bear the names of the gastric juice glands, or peptic- 

 gastric glands, or gastric-mucous and Lieberkuhnian tubes ; 

 finally, the uterine glands. Then, as modified structures, as 

 so-called convoluted glands, we have, finally, to mention the 

 smaller and larger sudoriparous glands, together with the ce- 

 ruminous glands of the ear. 



Very complicated tubular organs are, as we previously 

 mentioned, the kindey and testicle. 



b. Among the racemose glands are included a host of our 

 organs from the smallest to the largest dimensions. First 

 belong here all the small glands of the mucous membranes 

 of the body, then the so-called Brunner's glands of the duo- 

 denum, the sebaceous glands of the skin, and the Meibomian 

 of the eyelids. As larger and largest, the group includes : 

 the lachrymal gland, the various salivary glands, the pancreas, 

 the lacteal glands, then the Cowper's and Bartholinian glands 

 of the sexual system ; and, furthermore, the prostate. 

 Finally, according to their manner of origin, the lungs 

 should also be included here. We shall subsequently have 

 to refer more particularly to them, as well as to their prede- 

 cessors. 



c. The closed gland capsules. We scarcely need to repeat 

 that the ovarium forms the only gland of this kind in the hu- 

 man body. 



Our organs, with slight exceptions (the primitive kidney 

 and the generative glands), originate, in their cellular portions, 



