The plexus mesentericus superior possesses numerous fine white cords with relatively large fenestra and ganglia limited in number and dimension. This plexus possesses the peculiarity of the meshes or fenestra deviating considerably from the course of the artery. The plexus hepaticus, composed of branches from the nervus vagus dexter and plexus coeliacus, surrounds the hepatic artery with strong, flat cords in the form of a narrow-meshed network. The plexus lienalis ensheath the arteria renalis and is bedecked with numerous ganglia of varied dimension. Microscopic and macroscopic ganglia occur in the vascular plexuses.
Some macroscopic ones are constant, as the ganglion located on the external carotid artery.
In general the vasomotor nerves, sympathetic, form a plexiform nodular sheath around the blood vessels and enter with it into the substance of parenchyma of the organs. This arrangement of the nervus vasomotorius induces many physicians to adopt the idea that the nervus vasomotorius originally and essentially belonged to the vascular system, and is lost on the coats of the arteries. Hence the nervus vasomotorius of the abdomen consists of ganglion cells and nerve cords. It must be remembered that it is not the number of ganglion cells that designates the power of a nervous system to accomplish maximum labor, but it is particularly the number of conducting cords associating and connecting the ganglion cells which decides the superiority of nervous executive ability. The nervus vasomotorius is peculiarly rich in conducting cords, establishing rapid and frequent communication between its ganglion cells - governing every particular segment of the arterial channel.