The Edinger-Westphal nucleus provides preganglionic parasympathetic fibres that synapse in the ciliary ganglion. These postganglionic fibres reach the sphincter pupillae and ciliary muscle via which nerve?
- A Long ciliary nerves from nasociliary nerve
- B Inferior division of CN III directly
- C Short ciliary nerves ✓
- D Lacrimal nerve
Correct answer: C. Short ciliary nerves
Explanation
Postganglionic parasympathetic fibres from the ciliary ganglion travel via the short ciliary nerves to the sphincter pupillae and ciliary muscle. Long ciliary nerves carry sympathetic fibres (from superior cervical ganglion via nasociliary) and sensory fibres to the eyeball but NOT parasympathetic fibres from the ciliary ganglion. This distinction is tested in pupils — ciliary ganglion damage causes loss of light reflex but preserved accommodation (or vice versa in Adie's).
Reference: BD Chaurasia's Human Anatomy, 8th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.