The mylohyoid muscle forms the floor of the mouth and separates sublingual and submandibular spaces. Which nerve innervates it?

• A Glossopharyngeal nerve (CN IX)
• B Lingual nerve (V3)
• C Hypoglossal nerve (CN XII)
• D Mylohyoid nerve (branch of inferior alveolar nerve, V3) ✓

Explanation

The mylohyoid muscle is innervated by the nerve to mylohyoid, a branch of the inferior alveolar nerve (V3) given off just before the inferior alveolar nerve enters the mandibular foramen. It also innervates the anterior belly of digastric. The lingual nerve is sensory, CN XII is motor to tongue muscles, and CN IX supplies stylopharyngeus.

Reference: Gray's Anatomy, 42nd ed.

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Written and medically reviewed by the StethoPrep medical team.