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SP-IR axons in atria.
A. SP-IR axon bundle in the right atrium. B. SP-IR terminal end-net in the right atrium. C. SP-IR terminal end-net in the left atrium. D. SP-IR axons in the IVC. E. SP-IR axons in a PV. F. SP-IR axons formed varicose endings around ICG PNs. The inset reveals a few gangion cells and varicose terminals around the somata of these cells. Scale bar in A: 50μm for A-E; Scale bar in F: 50μm.
