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double, the posterior of which bears a very small ganglion. 
No exchange of fibres between the sympathetic and the 
vagus was observed. 
In the cranial sympathetic only 7 ganglia were found 
instead of 8. When the cord reaches the glosso- 
pharyngeus, instead of becoming attached to the ventral 
border of the ganglion and subsequently to that of Jacob- 
son’s anastomosis, it passes upwards internally to the ixth 
and becomes opposed to its upper division. This is due 
to the fact that when the ixth splits it forms a dorsal 
Jacobson’s anastomosis and a ventral post-trematicus, 
instead of the reverse as on the right side, and the 
sympathetic always accompanies the former. Ganglion 5 
lies quite clear of and above the glossopharyngeus, in 
striking contrast to the condition on the other side. As 
the cord passes through the jugular foramen it is for a 
time very tightly wedged into the angle formed by the 
outgoing post-trematicus vii. and the hyomandibular 
trunk. We could not determine whether there was any 
exchange of fibres between the sympathetic and the facial 
nerve, but if present it is not obvious. There is a large 
R. communicans (com. v.') to the base of the T. maxillo- 
mandibularis. 
The combined sympathetic and profundus nerve when 
they enter the eye muscle canal lie just above the ciliary 
ganglion. Instead, however, of passing straight down to 
the ganglion, as on the right side, they curve round the 
left rectus externus muscle, and describe an almost com- 
plete circle before reaching the ganglion. The few fibres 
forming the Radix longa and the sympathetic join with 
the fibres leaving the ciliary ganglion to form the R. 
ciliaris brevis. It is doubtful whether many of them 
enter the ganglion at all on this side. There are no other 
differences of importance between the two sides. 
a) 
