334 



MICROSCOPIC ANATOMY OF THE ORGANS. 



epidermis between the papillae and opens on the surface of 

 the stratum corneum by a round sweat pore (Fig. 241). 



In the secreting coiled portion of the gland (Fig. 255) the 

 wall of the tubule consists of a layer of cubical epithelium, the 

 cells of which contain a finely granular protoplasm. This often 

 includes fat droplets and brown pigment granules, and possesses 

 on the free surface of the cell a cuticle. Outside these gland 

 cells we always find in the larger glands a longitudinal layer 



FIG. 255. 



Muscle cells in a diagonally 

 cut tubule 



Gland ll t> /JV 



- * 4 ** 



Muscle cells 



Fork^l 

 muscle <<'// 



Muscle eel 



Nucleus of 

 gland cell 



r^r^v ^; 7ui/i I- -... 



i&^ism 



<^\-^T -*-'*^ *^ :*TA ^.s 



13X18^1 



Duct 



Fat cell 

 colored 

 by osmic 

 acid 



Some tubules of sweat grinds from the skin of a human finger. X 350. 



of spindle-shaped smooth muscle cells. Outside this there is 

 a connective-tissue membrana propria surrounding the whole 

 tubule. That part of the membrana propria immediately 

 adjacent to the gland is thin and homogeneous, and forms the 

 bf/xal membrane. 



The part of the duct which is present in the corium differs 

 from the secreting tubules in that there is a second layer of 

 epithelial cells in place of the smooth muscle elements. The 



