LECTURE IV. 



adjoining cells. It might indeed be objected, with re- 

 gard to the conditions of nutrition, that we have here 

 to deal with quite a peculiar arrangement of the vessels, 

 which are essentially of a venous nature, as being com- 

 posed of ramifications of the portal and hepatic veins, but 

 the hepatic artery also enters into the formation of this 

 capillary network, so that the blood in it cannot be 

 resolved into its individual arterial and venous consti- 

 tuents. Injections from each of the vessels named ulti- 

 mately find their way into the same capillary network. 

 In most parts, however, the relations do not present 

 such a simple form as in the liver ; considerable inter- 

 spaces often separate the individual cells, and no incon- 

 siderable quantities of these elements are enclosed in 

 every capillary mesh. I show you here a second object 

 derived from a fresh human brain from a lunatic who 

 died with his cerebrum in a highly hypergemic state. 



FIG. 29. 



The section has been made through the corpus striatum, 

 which was of a deep red colour. You have a good view 



Fig. 29. Natural injection of the corpus striatum of a lunatic, a, a. Gaps desti- 

 tute of vessels, and corresponding to the strands of nervous fibres which traverse the 

 ganglion. 80 diameters. 



