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parasympathetic root of ciliary ganglion
The parasympathetic root of ciliary ganglion provides parasympathetic innervation to the ciliary ganglion.
The ciliary ganglion is a ''parasympathetic'' ganglion. Incoming parasympathetic nerve fibers form synapses with the dendrites of nerve cells within the ganglion. However, the ciliary ganglion is not simply a relay station connecting ''preganglionic'' to ''postganglionic'' nerve fibers. There are roughly twice as many incoming parasympathetic fibers as outgoing parasympathetic fibers. Neural processing occurs as incoming signals ''converge'' onto target neurons.
==Presynaptic==
''Presynaptic'' parasympathetic fibers originate in the Edinger-Westphal nucleus, the parasympathetic motor nucleus associated with the oculomotor nucleus in the brainstem. Axons from the Edinger-Westphal nucleus and the oculomotor nucleus run together in the brainstem and exit together as the ''oculomotor nerve'' (cranial nerve III). The oculomotor nerve passes through the lateral wall of the cavernous sinus and enters the orbit through the ''superior orbital fissure''. It divides into branches that innervate the levator palpebrae superioris and four of the six extraocular muscles. Parasympathetic fibers initially run in the ''inferior division'' of the oculomotor nerve. They exit as one or two short “motor roots” that synapse in the ciliary ganglion.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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