Innervation of human trigeminal nerve blood vessels

Film preparations and histological sections of human trigeminal nerve impre gnated with silver nitrate and treated according to Falck-Hillarp revealed a rich innervation within the intraneural blood vessels. Highly diverse and complex neural interconnections were noted in the arterioles and venules o f the trigeminal ganglion capsule as well as in the epineurium and external layers of the perineurium of the trigeminal nerve branches. Neural plexuse s were detected on the vessel walls within these layers. Sensory innervatio n of the neural blood vessels was mainly relegated to polyvalent tissue-vas cular receptors with adrenergic neural plexuses encountered on the walls of the intraneural vessels.