HISTOLOGY. 87 



TH SEBACEOUS GLANDS. 



These glands are of the compound saccular type and 

 are located in the papillae of the corium. They consist 

 of acini, secreting cells and a duct. The sudoriferous 

 glands belong to the tubular type, and consist of a 

 basement membrane and gland cells and a duct. The 

 gland is located deep down in the tissue beneath the 

 skin. The deep end is coiled upon itself and the su- 

 perficial end is straight nearly all the way from the 

 coil to the cuticle. Just at the cuticle the duct becomes 

 tortuous and makes its way out as a little depression on 

 the surface of the skin. All these structures will be 

 seen when you study the skin. 



NAILS AND HAIR. 



The nails are derived from the epidermis, and are 

 composed of horny cells. The parts of a nail are 

 nail-body, nail-bed and nail-matrix. The nail-bed is 

 composed of the stratum Malpighii. The nail, there- 

 fore, grows in length and thickness by new cells from 

 the matrix. The body of the nail is composed of the 

 other layers of the cuticle. The stratum lucidum takes 

 the greater part in the formation of the nail as the 

 transparency indicates. 



The hair, like the nail, is derived from the skin, and 

 is found almost all over the body. There are no hairs 



