Abstract
The number of unmyelinated fibers in the cervical vagus trunk greatly exceeds the number of myelinated fibers. Kiss1 regards the unmyelinated fibers as sympathetic fibers which join the vagus trunk mainly in the region of the superior cervical sympathetic ganglion. He denies the existence of unmyelinated fibers in the vagus rootlets. According to Ranson and Chase,2 and others, the unmyelinated fibers in the vagus trunk arise from cells in the brain stem and emerge in the vagus rootlets.In the present investigation, carried out on cats, anatomical and experimental studies were made of the relationships between the cervical sympathetic and vagus trunks and their myelinated and unmyelinated components.The superior cervical sympathetic and nodose ganglia were removed together from several cats. Threads were then tied to each of the ends of the respective trunks and the 2 ganglia were tied upon a glass frame with sufficient tension to draw them slightly apart, to provide an opportunity for the demonstration of...
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