138 



TWELFTH LECTURE. 



either from the upper or lower germinal layer, from the cor- 

 neous and intestinal gland layer of Remak. The membrana 



propria and capillary reticulum are 

 aggregated productions of the middle 

 layer, which produces so much. 



A previous figure, 41, the primary 

 rudiment of a hair germ, passes as 

 well for the glands of the external in- 

 tegument as for those of the mucous 

 membrane. When, by a continuous 

 increase of the cells, lateral buds 

 branch off from the cellular cone as 

 it grows downwards, there is formed 

 at first a solid, slightly berry-shaped 

 mass (Fig. 129). It finally becomes a 

 complicated racemose system, which 

 at last becomes hollow (a), and 

 thereby constitutes the completed 

 gland. 

 With this we leave the glandular organs in general. 

 The subsequent lectures will, however, carry us back to 

 certain of them. 



Fig. 129. — Developing racemose 

 gland ; <?, excretory duct, already 

 permeable ; b, solid gland bud ; c, 

 membrana propria ; rf, surrounding 

 connective tissue. 



