Fig. 5

Htr3a-positive fibers in the joint capsule, anterior disc and retrodiscal tissues. (A) The left column shows NFH-positive fibers (A-fibers), the middle column shows Htr3a-positive fibers in Htr3a/tdTom mouse and the right column shows co-expressions of Htr3a and NFH-positive fibers in the mouse joint capsule, anterior disc and retrodiscal tissues. Pictures from the joint capsule, anterior disc and retrodiscal tissues as well as antibodies used and corresponding colors are indicated. Yellow arrows mark Htr3a⁺/NFH⁺ fibers, and blue arrows show Htr3a⁺/NFH^- nerves. (B) Percentages of Htr3a⁺ nerves relatively to mean pgp9.5⁺ nerves in a selected section for the joint capsule, anterior disc and retrodiscal tissues. Statistics is 2-way ANOVA Bonferroni’s pot-hoc test (n = 5–13). (C) Relative percentages for Htr3a⁺/NFH^-, Htr3a⁺/NFH^- and Htr3a^-/NFH⁺ nerves in the joint capsule, anterior disc and retrodiscal tissues. Statistics is 2-way ANOVA Bonferroni’s pot-hoc test (n = 5–6).