volume 28, issue 6, P746-749 2014
DOI: 10.3109/02688697.2014.920485
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R. Shane Tubbs, Edward P. Sorenson, Koichi Watanabe, Marios Loukas, Eyas Hattab, Aaron A. Cohen-Gadol

Abstract: Neuronal cell bodies were identified along the course of the SAN in human cadavers. Although the function is not certain, such cells have been found in other animals to be nocioceptive in nature. Pending further study, these cells may be found to be involved in enigmatic pain syndromes thought to arise in the sternocleidomastoid and trapezius muscles.