## Anatomical Division of Parotid Gland **Key Point:** The facial nerve (CN VII) is the key anatomical landmark that divides the parotid gland into superficial and deep lobes. ### Facial Nerve Course Through Parotid 1. The facial nerve emerges from the stylomastoid foramen 2. Enters the posteromedial aspect of the parotid gland 3. Divides into five main branches within the gland substance: - Temporal - Zygomatic - Buccal - Marginal mandibular - Cervical 4. The nerve trunk and its divisions serve as the anatomical plane separating superficial from deep lobe **High-Yield:** This anatomical relationship is clinically crucial — parotid surgery must preserve the facial nerve. The superficial lobe lies lateral to the nerve, while the deep lobe extends medially into the lateral pharyngeal space. **Clinical Pearl:** Damage to the facial nerve during parotid surgery results in facial paralysis on the ipsilateral side, affecting muscles of facial expression. ### Related Structures | Structure | Relationship to Parotid | | --- | --- | | Facial nerve | Divides into superficial and deep lobes | | External carotid artery | Lies medial to gland, gives off branches | | Retromandibular vein | Formed within the gland | | Auriculotemporal nerve | Sensory branch of CN V₃, runs with superficial temporal vessels | [cite:Clinically Oriented Anatomy 8e Ch 8] 
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