Figure 15
Summary figure describing the main findings of this study. Efferent postganglionic neurons send sympathetic postganglionic fibers to innervate the heart. TH, a commonly used catecholaminergic marker, labeled bundles of nerves, axons, and terminals innervating the atria. Additionally, TH-IR bundles were observed mainly passing through ICG and innervating fat cells and blood vessels. TH-IR neurons comprised about ~ 30% of ICG neurons. The presence of varicosities around TH-IR ICG neurons and whether there is direct innervation remains to be determined in the future (indicated by question mark). (Created by Ariege Bizanti with Biorender (2022), https://biorender.com/).
