452 F. W. CARPENTER 
corresponding ganglia in human beings. In man,as Sala (’10) and 
v. Lenhossék (’10) have shown for the ciliary, and Miller and Dahl 
(10) for the remaining autonomic cranial ganglia, as well as the 
ciliary, the dendrites are contained within the cell capsules. They 
are often bent and branched, and may run parallel with the sur- 
face of the cell-body for considerable distances, but they do not, 
as in the sheep, break through the capsular wall. 
The terminations of preganglionic fibers 
In the ciliary, sphenopalatine, otic and submaxillary ganglia 
of the sheep the preganglionic fibers terminate in end nets of fine, 
varicose fibrils embracing the cell-bodies of the postganglionic 
neurones (figs. 5, 6, 7, 8,9, 10). These end nets lie inside the cell 
capsules, and are at places in direct contact with the surfaces of 
the cell-bodies. We have, therefore, in the cranial autonomic 
ganglia essentially the same conditions in respect to synapses that 
obtain in the vertebral and prevertebral ganglia of the sympa- 
thetic subdivision of the system. Here the presence of subecapsu- 
lar end nets has been shown by a number of investigators, notably 
by Huber (99), who succeeded in differentiating these termina- 
tions with methylene blue in all classes of vertebrates from fishes 
to mammals. 
When examined in detail under high powers of the microscope, 
the pericellular plexuses are seen to arise through the terminal 
branching of one or more preganglionic fibers. The largest num- 
ber observed was four in the ciliary ganglion (fig. 5). Such fibers 
perhaps result from the division of a single preganglionic neurite, 
or they may be the terminal portions or collaterals of two or more 
distinct neurites. In all cases the fibers are non-medullated near 
the end nets, but when the conditions are favorable for following 
them, they may be traced, in the opposite direction, into bundles 
of fibers with thin medullary sheaths. 
The fibrils of which the pericellular plexuses are composed 
show many varicosities. These vary in size and are distributed 
irregularly along the course of the fibrils. Sometimes they are 
terminal in position, i.e., they occur at the tips of short free-ending 
