Fig. 2. The ganglion cardiacum at gestational age 10 weeks (crown-rump length 50 mm). Sagittal sections. Panels A and B are stained with hematoxylin and eosin, and panels C, D, and E with antibodies to S100, chromogranin A (chrA), and smooth muscle action (SMA), respectively. Panel A is 50 microns anterior to panel B; panel C corresponds to a square in panel A; and panels D and E correspond to the ganglion cardiacum (ggl) in a square in panel C. The ggl contains a large number of chrA-positive cells, but it does not express SMA. AO, aorta, BO, Botallo's duct (ductus arteriosus); BR, left main bronchus; LA, left atrium; LCCV, left common cardinal vein; PA, pulmonary artery; RAU, right auricle; RV, right ventricle; X, vagus nerve. Scale bars=1 mm (A–C), 0.1 mm (D, E).
