Figure 6.

Extension of the coeliac and inferior mesenteric plexuses in a CS18 (~44 days) embryo. Panels (a and b) show side views without and with ganglionic cells in the pre‐aortic plexuses, respectively (see also Figure S4A). Ventral plexus fibres have contacted the vagal nerve plexus on the stomach (panel [a]). Panels (c and d) show transverse sections at the levels indicated by dotted lines in panel (b). Scattered ganglionic cells (blue arrowheads) surround the root of the CA and invade the adrenal cortex (AC; panels [c and d]), whereas clustered ganglionic cells form the para‐aortic bodies (P; panel [d]). A branch of the lumbar splanchnic nerves has extended caudally and passes the umbilical arteries ventrally to form the superior hypogastric nerve (# in panel [a]). Bars (a, b) = 500 µm, (c,d) = 200 µm [Colour figure can be viewed at wileyonlinelibrary.com]