324 S. W. RANSON AND P. R. BILLINGSLEY 
STRUCTURE OF THE SUPERIOR CERVICAL GANGLION 
While we have examined a number of ganglia, including the 
stellate and coeliac, the observations which we have to report 
are restricted to the superior cervical ganglion. In the account 
which follows we will consider the results obtained by others, 
topic by topic, as we present our own. Unless otherwise stated, 
citations from the literature are applicable to the collateral 
ganglia and to all the ganglia of the sympathetic trunk. They 
should not be carried over without qualification to the terminal 
ganglia. These present special problems and require separate 
consideration. . 
Ganglion cells. It is well known that almost all of the neurones 
in the sympathetic ganglia are multipolar, although there are 
also a restricted number of unipolar and bipolar cells located 
near the poles of a ganglion or within its longitudinal fiber bundles, 
Huber (’99). Like other nerve cells these neurones have but a 
single nucleus, except in rodents. In the rabbit we have seen 
many cells with two nuclei. These have been figured and de- 
scribed with a summary of the related literature by Huber (’99). 
The neurofibrils of the cells of the sympathetic ganglia have been 
described by a number of authors, including Michailow (’08) 
and Cajal (711). The Nissl granules have been described and 
figured by Carpenter and Conel (’14). 
Dendrites. The dendrites of the cells of the sympathetic 
ganglion may be divided into two chief categories—intracapsular 
and extracapsular. The former, although presenting great vari- 
ety in length and form, are all situated beneath the cell capsule. 
Although these intracapsular dendrites are common in the 
sympathetic ganglia of man, they are rarely met with in the 
other mammals. Michailow (711), in his careful study of the 
collateral and trunk ganglia in horses, dogs, cats, rabbits and 
guinea-pigs, described and figures only one form of subcapsular 
dendrite. These are present on his cells of types II and V. 
They are short and club-shaped (fig. 8, a). There are usually 
from five to seven of them and they begin as relatively thick 
fibers soon going over into bulbous endings. A fiber may 
divide and end in two such clubs. The expanded ends of these 
