THE SKIN 167 



called the sebaceous glands (Lat. sebum, suet). They consist of 

 little saccules communicating with a common duct which opens 

 into the neck of the follicle. 



Fi S- 155. Magnified View of the lower portion of a Hair Follicle. 



a, hair, showing meduljary and cortical portions ; b and c, outer and inner layers of the 

 epidermic lining of the follicle ; d, the dermis of the hair follicle. 



Hairs are also provided with muscles. These are composed 

 of involuntary fibres, and pass from the side towards which the 



Fig. 156. Section of the Skin, showing the Hair Follicles, Sebaceous 

 Glands, and the Muscles of the Hairs. 



a, epidermis ; b, dermis ; c, muscles of the hair follicles ; d, sebaceous glands. 



hair slopes obliquely to the outer layer of the dermis. It is 

 evident, therefore, that when they contract they tend to make the 

 hair more erect. 



