The nerve of the pterygoid canal (Vidian nerve) is formed by the union of the greater petrosal nerve and the deep petrosal nerve. The greater petrosal nerve carries fibres from which nucleus?
- A Inferior salivatory nucleus
- B Superior salivatory nucleus ✓
- C Dorsal nucleus of vagus
- D Nucleus tractus solitarius
Correct answer: B. Superior salivatory nucleus
Explanation
The greater petrosal nerve is a branch of CN VII carrying preganglionic parasympathetic fibres from the superior salivatory nucleus (located in the pons). These fibres synapse in the pterygopalatine ganglion and provide secretomotor supply to the lacrimal gland and mucous glands of the nasal cavity and palate. The inferior salivatory nucleus provides fibres via the lesser petrosal nerve (CN IX) to the parotid gland via the otic ganglion. The deep petrosal nerve carries sympathetic fibres from the internal carotid plexus.
Reference: BD Chaurasia's Human Anatomy, 8th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.