102 NOKMAL HISTOLOGY. 



f Simple. 



(Tubular. . .. < 

 { Compound. 

 f Simple. 



^ Saccular < 



[ Compound, or race- 

 mose. 



(Basement membrane. 

 Secretory cells. 

 Structure . . . <j Lumen. 



Duct. 

 Development. 



There are two characteristic forms of glands tubular and sac- 

 ular either of which may be simple or. compound. A simple tu- 

 bular gland is cylindrical and elongated/ consisting of a basement 

 membrane lined internally with cuboidal or columnar cells which 

 constitute the fundus, the opening from the gland being styled the 

 duct. The empty space within the gland is the lumen. When the 

 lumen becomes divided by one or more partitions,, producing a clus- 

 ter of simple glands, we then have a compound tubular gland. The 

 saccular gland resembles in structure that of the tubular variety, but 

 in form it is broader, becoming inflated like a sac. A group of 

 simple saccular glands gives rise to the compound saccular, or race- 

 mose, variety. The chief function of glands is that of secretion. 

 The salivary glands, pancreas, and intestinal glands are illustra- 

 tions. 



III. PAROTID GLAND. 



The Parotid gland is a compound saccular gland of the serous 

 type. Its tissues are derived from the mesoderm and epiderm. Its 

 function is to produce saliva, a watery substance containing mi- 

 nute granules. 



OUTLINE OF THE PAROTID GLAND. 



f Secretory cells. 

 Acini. Basement mem- 



Ductules. 



Lobes <! Connective tissue. 



Stenson's duct. 

 Ducts 



Salivary tubes. 





