500 



PHYSIOLOGY 



CHAP. 



Pio. 138. (Left.) Hair follicle, longitudinal section. (Biesiadecki.) a, mouth of follicle ; b, i 

 of follicle ; c, lower bulbar swelling ; d, e, dermic coat (outer and middle layer ; the inner ( 

 hyaline layer is not seen) ; /, g, epidermic coat (inner and outer root-sheath) ; h, cuticle of 

 root-sheath ; k, medulla ; I, hair-bulb ; m, fat of subcutaneous tissue ; n, arrector pili ; 

 o, papilla of skin; p, papilla of hair-bulb; st, Malpighian layer of epidermis : </', stratum 

 corneum, erroneously represented in figure as continuation of inner root-sheath ; t, sebai'cmis 

 gland. 



Fio. 139. (Right.) Longitudinal section of a sebaceous gland from the cheek, with r. small hair 

 growing through its duct. Human. (Toldt.) 



