28 



OLOF LARSELL 



While myelinated fibers were present in the same bundles 

 which included processes from the unipolar cells, in no case was 

 a myelin sheath found in connection with processes from such 

 cells. 



Three distinct sizes of unipolar cells were observed. The 

 predominating size is represented in figure 5 {un.c), which also 



Fig. 7 Bipolar cell and accompanying unmyelinated fiber on the wall of a 

 blood-vessel between the cerebral hemisphere and the olfactory bulb. Kitten 

 two weeks old. Pyridin-silver technique. X 450. 



Fig. 8A Characteristic small bundle of myelinated and unmyelinated fibers, 

 with a single bipolar cell in its course. Fig. 8B Portion of a myelinated fiber 

 more highly magnified, showing a node of Ranvier, "and some large varicosities. 

 Both from kitten of two weeks. Pyridin-silver technique. Figure SA, X 660; 

 figure 8B, X 950. 



indicates very clearly the bifurcation of the single process of the 

 cell. Figure 5 {un.c'.) also shows one of the smallest of the uni- 

 polar cells seen. The process of this cell could not be followed 

 for any great distance ^nd no bifurcation was seen. The proc- 

 ess was directed peripherally. Attention may again be directed 

 to the pericellular basket surrounding this cell. The relation of 

 the cell to the nerve fiber of which this basket is the termination, 



