In anatomy, a ganglion ( plural ganglia) is a biological tissue mass, most commonly a mass of nerve cell bodies. Cells found in a ganglion are called ganglion cells, though this term is also sometimes used to refer specifically to retinal ganglion cells. In some dinosaurs, the ganglion in the pelvis was so large relative to its brain in its head that it could almost be said to have two brains. Neurology In neurological contexts, ganglia are composed mainly of somata and dendritic structures w… (More on Ganglia)