<prompt> Dilator pupillae is supplied by:Oeeulomotor III cranial nerveSympathetic fibres from the fronto-orbital branch of V nervePostganglionic parasympathetic fibres from Edinger- Westphal nucleusPostganglionic sympathetic fibres from cervical sympathetic chain  <response>: Ans. d. Postganglionic sympathetic fibres from cervical sympathetic chain Ref: Gray 39e p710; Parson 20e p33Dilator iridis pupillae is supplied by postganglionic nonmyelinated fibres from superior cervical sympathetic ganglia.Dilator papillae is supplied with non-myelinated post ganglionic fibers from the superior sympathetic ganglion.- Ref: Gray 39e p710Dilator pupillae is supplied by adrenergic fibers of cervical sympathetic nerves. The dilator tract probably commences in hypothalamus not far from constrictor centre and also has connection with cerebral cortex.- Ref: Parson 20e p33 Parasympathetic cholinergic pathway to sphincter pupillaeSympathetic adrenergic pathway to dilator iridis pupillaeNucleusFibers start from Edinger-Westphal nucleus near the 3rd nerve nucleus in floor of aqueduct of sylvius1st order neuron from hypothalamus till ciliospinal Budge center in interomediolateral columns of C8-T1PreganglionicNeuronThrough occulomotor 3rd nerve2nd order preganglionic neuron from budge ciliospinal center to superior cervical ganglion in neck cervical sympathetic neurons.GangliaCiliary ganglionQSuperior cervical ganglionQPost-ganglionic neuronShort ciliary nerve3rd order post ganglionic fibers arising from superior cervical ganglion, ascends carotid plexus along internal carotid artery to enter skull where they join nasociliary branch of trigeminal nerve.SupplySphincter papillaeDilator iridis pupillaeQ 