Scheme showing sympathetic and parasympathetic innervation of the pupil and sites of lesion in a Horner's syndrome. Pathways in the<unk> . Green = parasympathetic; Red = sympathetic; Blue = sensoryThe<unk>  contains postganglionic parasympathetic neurons that supply the<unk>  muscle and the pupillary sphincter muscle. Because of the much larger size of the<unk>  muscle, 95% of the in neurons in the<unk>  innervate it compared to the pupillary sphincter. Roots Three types of axons enter the<unk>  but only the preganglionic parasympathetic axons synapse there. The entering axons are arranged into three roots which join enter the posterior surface of the ganglion: * The sensory root branches from the nasociliary nerve and travels through the ganglion forming part of the short<unk>  nerves. These sensory axons supply the cornea,<unk>  body and iris. * The sympathetic root originates from the internal carotid plexus with cell bodies in the superior cervical ganglion. The axons pass through the ganglion and enter the eye without synapsing into the short<unk>  nerves. The sympathetic root contains the postganglionic sympathetic axons that provide sympathetic supply to the blood vessels of the eye. Sometimes, they also supply the pupillary dilator muscle, however these axons usually travel from the nasociliary nerve to the long<unk>  nerves to enter the eye. * The parasympathetic root branches from the inferior division of the oculomotor nerve and carries the preganglionic parasympathetic axons from the Edinger-Westphal nucleus to the<unk> . Within the ganglion the axons synapse onto the postganglionic parasympathetic neurons. These neurons project axons through the short<unk>  nerves to innervate the<unk>  muscle and pupillary sphincter muscle. Short<unk>  nerves Exiting from the anterior surface of the<unk>  are the short<unk>  nerves which contain the sensory, postganglionic sympathetic and postganglionic parasympathetic axons to the eye.
Ciliary ganglion
Stellate ganglion
Olfactory trigone
Optic vesicle
Optician
Optic stalk
Olfactory tract
Olfactory nerve