Expansion
Some Anatomists Vow Never Forget
Mnemonic
“Nerve, vein, artery”, from superficial to deep, which is the reverse of most places:
- Facial nerve (VII), most superficial, dividing the gland into surgical superficial and deep lobes
- Retromandibular vein
- External carotid artery, deepest, dividing into its terminal branches here
“The most superficial is the one you must not cut.”
The facial nerve does not supply the parotid; it merely passes through it. Secretomotor supply is glossopharyngeal (IX) via the otic ganglion and the auriculotemporal nerve.
That anatomy explains Frey’s syndrome: after parotid surgery, regenerating parasympathetic secretomotor fibres misdirect to the sweat glands of the overlying skin, causing gustatory sweating and flushing when eating.
Facial nerve palsy with a parotid mass means malignancy until proven otherwise, since benign tumours displace the nerve rather than invade it.
Expansion
- Facial nerve - most superficial
- Retromandibular vein - middle
- External carotid artery - deepest