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. 2016 May;78(2):215–227.

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Fig. 4 — Substance P (SP) positive nerve fibers (arrows) in submandibular gland (bar: 100 μm). SP-positive nerve fibers (arrows) are abundant within the body of the submandibular gland and form a reticular pattern along the outer wall of the main duct. a: SP-positive nerve fibers along the main duct of the submandibular gland (SMD), passing to the intralobular duct. b: Distribution of SP-positive nerve fibers along an intralobular duct. c: Distribution of SP-positive nerve fibers from the intercalated duct to the striated duct.