AUTHOR S ABSTRACT OF THTS PAPER ISSUED 

 BY THE BIBLIOGRAPHIC SERVICE, SEPTEMBER 13 



ON THE GROWTH OF THE NEURONS COAIPOSING 



THE GASSERIAN GANGLION OF THE ALBINO 



RAT, BETWEEN BIRTH AND MATURITY 



KENJI NITTOXO 



The Wistar Institute of Anatomy and Biology 



FIVE CHARTS AND ONE PLATE (TWELVE FIGURES) 



In the neurological laboratory of The Wistar Institute a 

 systematic study of the growth of the neurons forming the 

 cranial and spinal ganglia of the albino rat is in progress. In 

 a paper by Donaldson and Nagasaka ('18) a series of observations 

 on the later growth of the cells and fibers forming the seventh 

 cervical spinal ganglion have already been reported. The 

 cranial ganglia are of course somewhat specialized and modified, 

 and at the suggestion of Doctor Donaldson I took up the study 

 of the growth of the neurons in the gasserian ganglion to obtain, 

 data which might be compared with those already at hand for 

 a typical spinal ganglion. 



I was asked to determine the increase in the diameter of the 

 largest cells and their associated fibers in the gasserian ganglion 

 of the albino rat from birth to maturity and to add such other 

 observations as became necessary in the course of the investi- 

 gation. 



MATERIAL AND TECHNIQUE 



For this entire study seventy-six normal male albino rats were 

 employed. For the study of the ganglion cells thirty-eight rats 

 were used. These ranged from birth to 485 days in age and 

 from 5.4 to 339 grams in body weight. The data appear in 

 table 1. 



For the study of the nerve fibers thirty-nine rats were em- 

 ployed, which ranged from 4 to 485 days in age and from 6.7 

 to 320 grams in body weight. These data appear in table 2. 



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