280 



THE BLOODVESSELS, BY C. J. EBERTH. 



Frog, whilst I have also observed them in the hyaloid. Threads 

 of a similar nature occasionally form connecting bridges between 

 neighbouring vessels. The diameter of these processes is often 

 far less than that of the capillary from which they spring, and 

 is insufficient for the passage even of a single blood corpuscle. 

 These outgrowths, which act as vasa serosa, and as the youngest 

 sprouts of growing capillaries, render it highly probable that 

 even in adult animals a new formation of vessels occurs, though, 

 perhaps, only to a limited extent. 



In many and especially in large recently formed capillaries, 

 whether produced under normal or under pathological condi- 

 tions, as, for example, in the membrane capsulo-pupillaris, the 

 wall may be almost immediately broken up into finely granular 

 fusiform protoplasmic masses. 



A similar cellular structure may be rendered apparent in the 



Fig. 49. 



Fig. 49. Capillaries from the membranahyaloidea of the adult Frog, 

 showing a thread-like solid anastomosis between them, a b, cells be- 

 longing to the tunica adventitia. 



capillaries of adult animals by various modes of preparation. 

 Thus Klebs* observed that in the urinary bladder of the Frog, 

 after treatment with phosphate of soda, the nuclei of the capil- 



* Virchow's Archiv, Bandxxxii., p. 172, 1865. 



