Postganglionic sympathetic fibres from the superior cervical ganglion reach the dilator pupillae and superior tarsal muscle via which structure?
- A Vagus nerve
- B Internal carotid nerve and plexus ✓
- C Short ciliary nerves
- D Greater petrosal nerve
Correct answer: B. Internal carotid nerve and plexus
Explanation
Postganglionic sympathetic fibres from the superior cervical ganglion travel along the internal carotid artery via the internal carotid nerve and plexus, entering the skull and eventually reaching the orbit to supply the dilator pupillae and superior tarsal muscle. The vagus is parasympathetic and sensory. Short ciliary nerves carry sympathetic fibres only after they have travelled along the ophthalmic artery. The greater petrosal nerve carries parasympathetic fibres. Ref: Gray's Anatomy, 42nd ed, p 761.
Reference: Gray's Anatomy, 42nd ed.
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Written and medically reviewed by the StethoPrep medical team.