LECTUBE IV. 



FEBRUARY 24, 1858. 

 NUTRITION AND ITS CHANNELS. 



Action of the vessels Relations between vessels and tissues Liver Brain Mus- 



calar coat of the stomach Cartilage Bone. 

 Dependence of tissues upon vessels Metastases Vascular territories [Gefassterri- 



torien] (vascular unities) Conveyance of nutriment in the juice-conveying 



canals (Saftkanale) of the tissues Bone Teeth Fibro-cartilage Cornea 



Semilunar cartilages, 



ACCORDING to the ideas usually entertained with re- 

 gard to nutrition, the vessels are regarded as the canals 

 by means of which not only the interchange of material 

 (Stoffverkehr) is accomplished, but upon the assistance 

 of which, sometimes actively and sometimes passively 

 afforded, reliance is placed whenever it is required 

 to control an individual part in its interchange of 

 material. The regulating principle in the process of 

 nutrition was long designated by an expression which 

 has even crept into the language of the present day, 

 namely, the " action of the vessels/ 7 as if they were 

 endowed with a special power of actively influencing the 

 condition of the neighbouring histological constituents. 



As I pointed out to you the last time, when upon the 

 subject of muscular fibres (p. 85), we can now-a-days 

 only speak of action in the vessels as far as muscular 



fibres are present in them, and the vessels are thus 



101 



