PLATE 1 



EXPLANATION OF FIGURES 



1 Large anterior horn cell of the spinal cord in which the mitochondria are 

 typically filamentous. They are longer in the processes than they are in the 

 neighborhood of the nucleus. They may be seen imbedded in the flake-like Nissl 

 substance. 



2 Cells from the nucleus of the corpus trapezoideum. The striking feature 

 is the presence of relatively enormous block-like mitochondria in the peripheral 

 cytoplasm, leaving certain areas devoid of mitochondria. It is to be noted fur- 

 thermore that the mitochondria are quite minute in the immediate vicinity of the 

 nucleus. A large pericellular arborization is visible between the two cells. 



3 A mitral cell from the olfactory bulb. Filamentous mitochondria are to 

 be seen embedded in a homogeneous background of Nissl substance. 



4 Large pyramidal cell from the hippocampus showing practically the same 

 arrangement of mitochondria as in the preceding. 



5 A large cell of the mesencephalic nucleus of the fifth nerve with a cell of 

 the locus coeruleus immediately adjacent. This large cell is among the most 

 remarkable seen in the whole nervous system. It contains large numbers of 

 small rod-like mitochondria and the striking resemblance which it bears to the 

 large cells of the Gasserian ganglion (fig. 7) is at once apparent. 



6 Small cell of Gasserian ganglion with minute granular mitochondria 

 clumped about the nucleus. 



7 Large cell of Gasserian ganglion containing an abundance of granular 

 mitochondria in sharp contrast with the filamentous mitochondria which occur 

 in the majority of other nerve cells. 



346 



