Through which anatomical structure does the nerve that provides MOTOR innervation to the lower lip pass?

Correct answer: C. Parotid gland

• A. INCORRECT. The pterygomaxillary fissure transmits maxillary vessels and is associated with the maxillary nerve (CN V2), not the motor supply to the lower lip.
• B. INCORRECT. The foramen ovale transmits CN V3 (mandibular nerve, sensory and motor) and the accessory meningeal artery. While CN V3 has motor components (to muscles of mastication), it is not the primary structure for motor innervation of the lower lip skin.
• C. CORRECT. Motor innervation to the lower lip musculature (orbicularis oris) is provided by the marginal mandibular branch of the facial nerve (CN VII). The facial nerve exits the stylomastoid foramen and passes through the parotid gland, where it divides into its five major branches (temporal, zygomatic, buccal, marginal mandibular, cervical). The marginal mandibular branch then innervates the lower lip and chin depressors.
• D. INCORRECT. While the infratemporal fossa contains important nerves and vessels (CN V3, chorda tympani, lingual nerve), the motor nerve to the lower lip (marginal mandibular branch of CN VII) passes through the parotid gland, not the infratemporal fossa.