192 



MUCOUS MEMBRANES 



Compound tubular glands include the kidney, testis, lachrymal 

 gland, and liver. The finer structure of the glands of this type is 



so peculiar that the reader must be re- 

 ferred to the several chapters in which 

 they are more fully described. 



Compound Tubulo-alveolar Glands 

 (Tubulo-acinar or Racemose Glands). 

 This is the most widely distributed of 

 all the types of secreting glands. It 

 includes the parotid, the submaxillary, 

 the larger mucous and serous glands of 

 the oral cavity, and of the nose, phar- 

 ynx, trachea, bronchi, and esophagus, 

 Brunner's glands in the duodenum, 

 the pancreas, Cowper's glands, Littre's 

 glands, and the large mucous glands of 

 the cervix uteri. 



The form of these glands may be 

 likened to 



a much branched tree, whose stem as 

 the main excretory duct opens upon 



FIG. 174. MODEL OF A RECON- 

 STRUCTION OF THE LACHRY- 

 MAL GLAND OF MAN. 



The tubular duct divides into 

 the terminal secreting tubules. 

 x 170. (After Maziarski.) 



FIG. 175. RECONSTRUCTION OF A MUCOUS 



GLAND FROM THE RESPIRATORY RE- 

 GION OF THE NASAL MUCOSA OF A 

 CHILD. 



The duct passes directly into the se- 

 creting alveoli. A typical small tubulo- 

 alveolar gland. x 200. (After Mazi- 

 arski.) 



FIG. 176. RECONSTRUCTION OF AN INTRA- 

 LOBULAR DUCT DIVIDING INTO ITS 

 TERMINAL INTEfcC ALL AR Y DUCTS AND 



ACINI. 



The terminal divisions of a large com- 

 pound tubulo-acinar gland. The model was 

 made from serial sections of the human 

 pancreas, x 344. (After Maziarski.) 



