THE MEDULLA OBLONGATA AND BRAIN. 



233 



portcs of these lymphatic spaces into the venous blood cur- 

 rent. This naturally requires further confirmation. 



The venous plexus, the plexus choroidei, contains an im- 

 mense vascular convolution in undeveloped connective tissue. 

 Its covering is formed by a low cubical epithelium, which runs 

 downwards into numerous points. 



