The forehead is innervated by branches of the trigeminal nerve, not the facial nerve. Specifically, the forehead is primarily innervated by the supraorbital nerve and the supratrochlear nerve, both of which are branches of the ophthalmic division of the trigeminal nerve. The provided reference discusses the facial nerve, which controls facial expression muscles but does not innervate the forehead for sensory perception.
Understanding Forehead Innervation
| Nerve | Source | Function |
|---|---|---|
| Supraorbital nerve | Ophthalmic division of Trigeminal nerve | Sensation to the central forehead and upper eyelid |
| Supratrochlear nerve | Ophthalmic division of Trigeminal nerve | Sensation to the inner forehead |
The facial nerve (nervus facialis), as described in the reference, primarily controls the muscles of facial expression, including those in the forehead. However, it does not provide sensory innervation to the forehead. It's crucial to distinguish between motor function (controlled by the facial nerve) and sensory perception (provided by the trigeminal nerve branches).
Key Points:
- The forehead receives sensory innervation via the supraorbital and supratrochlear nerves.
- These nerves are branches of the trigeminal nerve.
- The facial nerve (as per the reference) is primarily responsible for motor function, not sensory in the forehead.
