500 



PHYSIOLOGY 



CHAP. 



FIG. 138. (Left.) Hair follicle, longitudinal section. (Biesiadecki.) a, mouth of follicle ; I, neck 

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

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

 root-sheath ; 7c, 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 ; ep, stratum 

 corneum, erroneously represented in figure as continuation of inner root-sheath ; t, sebaceous 

 gland. 



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

 growing through its duct. Human. (Toldt.) 



