The<unk>  is a branch of the frontal nerve, itself a branch of the ophthalmic nerve (CN V1) from the trigeminal nerve (CN V). It provides sensory innervation to the skin of the forehead and the upper eyelid.
Supratrochlear nerve
Auriculotemporal nerve
Oculomotor nerve
Nerve of pterygoid canal
Buccal branches of the facial nerve
Marginal mandibular branch of the facial nerve
Olfactory nerve
Iris dilator muscle