ix THE SKIN AND CUTANEOUS GLANDS 499 



plentiful in the regions beset with hairs or down, and are few in 

 the parts destitute of hair, and entirely absent from the palm of 

 the hand and sole of the foot. 



Externally the sebaceous glands are pear-shaped or acinar. 

 They are of unequal size, and are not in proportion with the 

 thickness of the hair to which they are attached. Those of the 



FIG. 137. Sweat-prints showing suspension of secretion by local application of atropine. (Aubert. 

 The area Air.*, to which a sponge soaked in atropine was applied, shows no sweat-prints 

 Atr.9, which was covered with belladonna plaster, also shows none. The centre, on which a 

 sponge soaked in plain water was laid, remained unaltered. 



alae of the nose and the cheeks are larger than elsewhere, though 

 connected only with the fine, downy hairs of those parts (Fig. 139). 



The epithelial cells which line them are polygonal, and charged 

 with fat-granules. The cavity of the gland is filled by a granular 

 mass, the sebum, which lubricates the hairs and the stratum 

 corneuni. 



Sebaceous glands are also found in the mucous membrane of 

 the labia majora and rninora of the vulva, in the clitoris, the 

 glands and prepuce, and in the eyelid (Meibowmian glands). The 



