244 



R. L. KITCHELL 



in the chorda tympani nerve of less than 6/1 in diameter. The horse and 

 the cow have, on the average, 10 per cent of the fibers in the chorda tympani 

 nerve larger than 10// in diameter. In the goat, pig, sheep, and dog, 3 per 



2 4 I 10 12 14 10 10 20 2 4 6 I 10 12 14 16 10 20 2 4 8 10 12 14 10 18 20 



COW 60AT SHEEP 



2 4 8 10 12 14 16 18 20 

 HORSE 



2 4 10 12 14 16 10 20 

 PI6 



:':':-:-:-:-:\n 



-r-r-i 0- 



ritciciiis t — 

 B — 



x-| — I — I — r 



2 4 S 8 10 12 14 16 18 20 2 4 6 8 10 12 14 16 18 20 2 4 6 8 10 12 14 16 18 20 



006 CAT SHEEP 



Ml C R O N S 



Fig. 9. Histograms of fiber diameter distribution myelinated fibers in chorda 

 tympani of various animals. See Figs. 6 and 7 for photomicrographs of these 

 nerves. The superimposed histograms of the fascicuH from a sheep illustrates 

 fiber diameter distribution in each individual fasciculus. See also Table 1. 

 (Engebretsen and Kitchell, unpublished). 



cent of the myelinated fibers were larger than 10// in diameter. In the cat 

 only 1 per cent of the fibers were larger than 10// in diameter. Analysis of 

 the fiber diameter distribution by fasciculus in a fasciculated nerve has not 



