BRANCHES OF GANGLION CERVICALE SUPERIUS aie 
TABLE 3 
Branch to the hypoglossal nerve 
DIAMETERS OF MYELINATED FIBERS 
can | ivsquare [NUMBER oF| "SOC ane 
RULE DES) MILLIMETER | 1 3+t03.3n| 3.3t04.5n| 4.5 to6.6u| 6.6 to 7.5u 
per cent per cent per cent per cent 
IV 0.0020 6 3123.75 100 
VII 0.0019 48 24696 .0 86 v a 
VII 0.0049 6 1108.85 50 50 
VIII 0.0029 6 1984.5 50 50 
IX 0.0025 22 8734.25 95 5 
xX 0.0068 20 2964.5 40 25 15 15 
it again as a branch from its lower pole. This nerve contains a 
large number of medullated fibers which are for the most part 
of medium size. When it comes from the superior laryngeal 
nerve it may receive a branch from the superior cervical gan- 
glion consisting chiefly of unmyelinated fibers. 
BRANCHES TO THE HYPOGLOSSAL 
A constant branch (1) is found coming from the upper pole, and 
is the most lateral of the group of basal bundles, the remainder of 
which are continued along as the internal carotid plexus. It 
runs upward toward the base of the skull, and is found to com- 
municate with the twelfth nerve within its bony canal. 
In one instance (11) a small branch was found to come off from 
the medial part of the lower pole beside the usual branch to the 
superior thyroid artery. It was continued downward with that 
nerve to the thyroid artery, along which it coursed for a short 
distance, and then ran slightly upward to communicate with a 
branch of the twelfth nerve. 
A glance at table 3 will show the variation in the myelinated 
fiber content which we have already noted in other nerves. The 
actual number found varies from six to forty-eight, and there is 
an even greater variation in the number per square millimeter. 
The great majority of the fibers did not exceed 4.5u in diameter, 
but in certain specimens larger fibers were also found. In one 
instance 15 per cent measured more than 6.6u, seven of these 
fibers having a diameter of 7.5y. 
