## Anatomical Landmark of the Parotid Gland **Key Point:** The facial nerve (CN VII) is the primary anatomical divider of the parotid gland into superficial and deep lobes as it emerges from the stylomastoid foramen and traverses through the gland substance. ### Course of Facial Nerve Through Parotid 1. Exits stylomastoid foramen 2. Enters the parotid gland posteriorly 3. Divides into its five terminal branches (temporal, zygomatic, buccal, marginal mandibular, cervical) 4. Creates a natural plane that separates superficial lobe (lateral to nerve) from deep lobe (medial to nerve) ### Clinical Significance **High-Yield:** The facial nerve's course through the parotid is the most important anatomical relationship for: - Parotid surgery (superficial parotidectomy preserves the nerve) - Bell's palsy pathophysiology (inflammation within the rigid parotid capsule compresses CN VII) - Parotid tumours (facial nerve involvement indicates malignancy) **Clinical Pearl:** Surgeons use the posterior belly of the digastric muscle and the styloid process as landmarks to identify the facial nerve trunk within the parotid gland. ### Mnemonic: "FAZZ" **F** — Facial nerve divides parotid **A** — Anterior (superficial lobe) **Z** — Zone (deep lobe medial to nerve) **Z** — Zero (no other nerve divides it) 
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