Do the same nerve supply the muscles of facial expression and mastication?

The correct answer highlights the fact that the muscles of facial expression and the muscles of mastication are supplied by different cranial nerves. The muscles of facial expression are innervated primarily by the facial nerve (cranial nerve VII), while the muscles involved in mastication are innervated by the trigeminal nerve (cranial nerve V), specifically its mandibular branch.

Understanding this distinction is crucial in both anatomical and clinical contexts, as it explains the functionality of these muscle groups and the implications when either nerve is affected by injury or disease. The differentiation in nerve supply also helps in diagnosing conditions affecting either muscle group, ensuring targeted and appropriate interventions in TMJ-related disorders.