XXVIl] SKIN. SENSORY NERVE ENDINGS 209 



dense connective tissue, internally of a hyaline mem- 

 brane (the hyaline membrane varies in distinctness). 



Note under a high power that the hair bulb 

 consists of an outer row of columnar or cubical cells 

 and of inner polyhedral cells, and that the cells are 

 continuous laterally with the root sheath and centrally 

 with the hair. 



e. The sebaceous gland (or glands) attached to 

 each hair. It consists of a duct, and of a variable 

 number of alveoli. The duct opens into the upper 

 part of the hair follicle, its epithelium is continuous with 

 that of the root sheath. The alveoli consist of roundish 

 masses of polyhedral cells in which the cell substance 

 appears as a network owing to the solution of the fatty 

 globules it contained. 



/. The erector muscle of the hair. The 

 erector stretches as a band of unstriated muscle from 

 the upper part of the dermis obliquely inwards to the 

 dermic sheath of the hair, a little below the sebaceous 

 gland. 



g. One or two sweat glands may be present, but 

 they will be better seen in 2. 



2. Section of the tip of the finger; stain with 

 hsematoxylin. Note in the sweat glands the gland 

 duct, a small tube showing in the dermis numerous 

 nuclei; it consists of two or three layers of cells 

 continuous with those of the Malpighian layer of the 

 epidermis. In the epidermis the lumen of the duct is 

 continuous with a tubular and more or less spiral 

 channel between the cells. 



The terminal secreting tube in the sub-cutaneous 

 L. H 



