PAROTID GLAND 



239 



molar tooth of the upper jaw. The parotid gland is an organic, branched 

 serous gland, subdivided into lobes and lobules. The accessory parotid 

 gland appears as a lobe separated from the others. The parotid duct is 



Intercellular 

 secretory 

 capillaries. ; 



FIG. 230. SECTION OF A SEROUS GLAND 

 FROM THE TONGUE OF A MOUSE. X 240. 



Prepared by Golgi's method, a precipitate 

 has formed in the ducts. The right 

 lower part of the figure has been com- 

 pleted by adding the cell outlines. 



FIG. 231. PART OF A CROSS SECTION OF 

 THE SECRETORY DUCT FROM THE 

 PAROTID GLAND OF A MOUSE. 



The basal rods (mitochondria) toward the 

 lumen break apart into secretory- 

 granules. 



Fat cells. 



End piece. . 



End piecees. 



FIG. 232. DIAGRAM OF THE HU- 

 MAN PAROTID GLAND. 



FIG. 233. SECTION OF THE PAROTID GLAND OF AN ADULT MAN 



X 252. 

 The very narrow lumen of the alveolo-tubular end pieces is not 



shown. 



characterized by a thick membrana propria, and consists of a two-layered 

 columnar epithelium with occasional goblet cells. As the duct branches 

 repeatedly, the epithelium becomes a simple columnar epithelium, after 



