Innervation of human nasal polyps.

Nasal polyps from 12 patients were studied by means of transmission electron microscopy. Nerve fibers in the polyp could be recognized in 4 out of the 12 polyps. Both myelinated and nonmyelinated nerve fibers were observed. The endings of the nonmyelinated nerve were adrenergic and observed in the area close to the smooth muscle cells of the artery. The secretory cells in the form of acini did not accompany nerve endings although these acini contained myoepithelial cells. Some nerves had normal features but others had a degenerated form in the pedicle of the nasal polyp. No cholinergic fibers were observed in these polyps.