322 



PRACTICAL HISTOLOGY. 



[XXIX. 



the papilla of the hair follicle (fig. 309) projecting into it, and con- 

 tinuous with the corium. 



(b.) The sebaceous gland or glands. In a balsam preparation 



FIG. 309. V.S. Hair-Follicle of Human Scalp, i and 2. Outer and inner fibrous sheaths 

 of hair-follicle ; 3. Hyaline layer ; 4. Outer, and 5 and 6. Inner root-sheaths ; p. Root 

 of hair, with its papilla; A. Arrector pili muscle; C. Ciitis vera,- a. Subcutaneous 

 tissue, with fat lobules; b. Epidermis (horny layer); d. Rete Malpighii ; g. Blood- 

 vessels ; v. Lymphatics of papilla ; h. Fibrous part, i. Medulla, k. Cuticle of hair ; 

 K. Sweat-gland and its coil. 



its acini are yellowish and clear, opening by a duct into the hair- 

 follicle at about its upper third (fig. 309, T). 



(c.) The arrector pili muscle (smooth muscle) stretching ob- 



