THE SKIN 



A sebaceous gland consists of a dilated saccular fundus, a con- 

 stricted neck, and a short and narrow duct. Occasional glands 

 are formed by a single saccule, but more frequently they are com- 

 pound, the several saccules opening by a single short duct which 

 is lined by flattened cells. In the Meibomian glands the secreting 



a 



FIG. 191. SEBACEOUS GLANDS IN THE SCALP OF A CHILD. 



a, hair follicle; >, sebaceous gland; c, hair follicles in oblique section; d, horny 

 layer of the epidermis; e, Malpighian layer; /, derma; g, blood vessel. Hematein and 

 eosin. Photo, x 83. 



saccules are connected with the long excretory duct by means of 

 a short intercalary duct. The fatty secretion of the sebaceous 

 glands, sebum, is formed by the direct disintegration of the proto- 

 plasm of the glandular epithelium. 



The saccules of the sebaceous glands are invested by a thin 

 connective tissue tunic and a delicate basement membrane. They 



