1.14.16.2 tyrosine 3-monooxygenase vagus nerve the superior cervical ganglion of the sympathetic nervous system is filled with many neuronal somata and fibers with strong immunoreactivity for tyrosine hydroxylase, TH-positive fibers are not evenly distributed within the nerve bundles of the ganglia, but tend to be located at their circumference 687980 2.3.1.6 choline O-acetyltransferase vagus nerve dorsal motor nucleus of the vagus nerve, contains a peripheral-type pChAT, a splice variant that lacks exons 6-9 of the common-type ChAT, cChAT 704830