278 F. W. CARPENTER AND J. L. CONEL 



3. As far as our anatomical observations go there is nothing to 

 indicate that ganghon cells of opposite, i.e., motor and sensory 

 function exist in the symj)athetic system. If their structural 

 similarity is an indication of similarity in function, then all must 

 be motor, since it is the presence of intrinsic sensory neurones 

 only that it is open to question. 



4. The sympathetic ganglion cells of the rat, mouse, thir- 

 teen-lined spermophile, prairie dog, muskrat, guinea-pig and 

 porcupine present a Nissl picture similar to that seen in the 

 sympathetic cells of the rabbit. 



5. In the rabbit many binucleate cells were found in the verte- 

 bral and prevertebral ganglia of the trunk region (sympathetic 

 division proper of the autonomic system). Such cells were not 

 seen in the cranial autonomic ganglia, nor in the plexuses of the 

 intestinal wall (peripheral ganglia). 



6. The sympathetic ganglia of the guinea pig, muskrat and por- 

 cupine possess, like those of the rabbit, a considerable nurr ber 

 of cells with two nuclei. Such cells are rarely if ever to be found 

 in the sympathetic ganglia of certain other rodents, viz., the 

 rat, mouse, thirteen-lined spermophile and prairie dog. 



LITERATURE CITED 



Apolant, Hugo 1S96 Ueber die sympathischen Ganglienzellen der Nager. 

 Arch. f. mikr. Anat., Bd. 47, pp. 461-471. 



Cajal, S. Ramon Y 1906 Las cellulas del gran simpatico del hombreadulto. Trab. 

 del lab. de invest, bid. de la univers. de Madrid, Tomo 4. 



DoGiEL, A. S. 1896 Zwei Arten sympathischer Nervenzellen. Anat. Anz., Bd. 

 11, pp. 679-687. 



1908 Der Bau der Spinalganglien des Menschen und der Saugertiere. 

 Jena. 



Eve, F. C. 1896 Sympathetic nerve cells and their basophil constituent in 

 prolonged activity and repose. Jour. Physiol., vol. 20, pp. 334-353. 



Jacobsohn, L. 1910 Struktur und Funktion der Nervenzellen. Neurol. Cen- 

 tralb., Jahrg. 29, pp. 1074-1083. 



