splenic plexus splenic plexus the splenic plexus (lienal plexus in older texts) is formed by branches from the celiac plexus, the left celiac ganglion, and from the right vagus nerve. splenic plexusthe celiac ganglia with the sympathetic plexuses of the abdominal viscera radiating from the ganglia. (lienal plexus labeled at upper right.)detailsinnervatesspleenidentifierslatinplexus splenicusta98a14.3.03.023ta26698fma6634anatomical terms of neuroanatomy it accompanies the lienal artery to the spleen, giving off, in its course, subsidiary plexuses along the various branches of the artery.