OCULOMOTOR PARASYMPATHETIC PATHWAY TO THE ACCESSORY CILIARY GANGLION BYPASSING THE MAIN CILIARY GANGLION BYWAY OF THE TRIGEMINAL NERVE

When an HRP or WGA-HRP solution was injected into the rostral midbrain including the oculomotor visceral nuclei, densely distributed HRP/WGA -HRP-positive granules were observed around the ganglion neurons in th e accessory ciliary ganglion (ACG) and ectopic neurons in the communic ating branch from the long ciliary nerve to the ACG. The same injectio ns labeled fibers within the communicating branch as well as the fiber s between the ACG and the main ciliary ganglion (CG). These findings i ndicate that some oculomotor parasympathetic preganglionic fibers reac h the ACG bypassing the CG by way of the trigeminal nerve.