THE CERVICAL SYMPATHETIC TRUNK 320 
or rings. The long thick process which is seen piercing the cap- 
sule in the illustration is probably the axon, although it might 
be an extracapsular dendrite. In that case one would have to 
assume that the axon came off from that surface of the cell which 
has been cut away at the plane of section. 
According to Cajal, these dendrites frequently apply them- 
selves against the capsule to terminate on its internal surface or 
among the satellite cells by pear-shaped thickenings. Some- 
times they are more delicate and bend in beneath the capsule 
to terminate by fine pale extremities. Sometimes they run 
beneath the capsule in great circles about the cell. The dendritic 
nest which envelops the cell is easy to distinguish from the rami- 
fications of axons by the greater caliber of its fibers and the 
rarity of its divisions. Cajal’s figures show that the spaces among 
the subeapsular dendrites contain small cells which he calls 
satellite cells. 
The dendrites which enter into the formation of the glomeruli 
are also subcapsular, but are usually coarser than those just 
described. Instead of coming off from all parts of the surface 
of the cell, they usually arise from a restricted region. Branch- 
ing repeatedly and interlacing they form a mass of considerable 
size over which the capsule of the cell is continued. Cajal has 
shown that the spaces between the dendritic branches are 
occupied by satellite cells. Following his classification, we may 
enumerate simple, bicellular, tricellular, and multicellular glom- 
eruli according to the number of neurones the dendrites of 
which enter into their formation. 
The simple glomeruli are formed from the dendrites of one cell. 
They are short and thick, come off from one side of the cell, and 
raise the capsule to form a pocket within which these dendrites 
Fig. 4 Nerve cell surrounded by dendritic crown from the ganglion cervicale 
superius of man. Pyridine silver. X 800. 
Fig. 5 From the ganglion cervicale superius of man. a, unicellular dendritic 
glomerulus; b, cell provided only with extracapsular dendrites. Pyridine silver. 
x 800. 
Fig. 6 Tricellular glomerulus from the ganglion cervicale superius of man. 
Pyridine silver. X 700. 
