The mylohyoid nerve, acting as an accessory nerve, may provide supplemental innervation to which mandibular teeth?

The mylohyoid nerve is a branch of the inferior alveolar nerve (IAN) that arises before the IAN enters the mandibular foramen. While primarily a motor nerve to the mylohyoid muscle and anterior belly of digastric, it can carry accessory sensory fibers to the mandibular first molar region, providing an anatomical explanation for incomplete anesthesia after an IAN block. This accessory innervation is relevant clinically because it can cause failure of the IAN block during procedures on mandibular molars, particularly the first molar.