The Olfactory nerve. CN1 Cranial Nerve I, or the first cranial nerve called the Olfactory nerve.
The second cranial nerve is the optic nerve.
The nerves involved in diplopia include three cranial nerves: the oculomotor nerve (third cranial nerve), the abducens nerve (sixth cranial nerve), and the trochlear nerve (fourth cranial nerve).
Cranial nerve 4 (IV) is the trochlear nerve.
cranial nerve I: olfactory:smell cranial nerve II:optic:vision cranial nerve III: oculomotor: 4 of 6 eye muscles cranial nerve IV: trochlear: cranial nerve V: Trigeminal cranial nerve VI: Abducens cranial nerve VII: Facial cranial nerve VIII: Vestibulochlear: hearing cranial nerve IX: Grosspharnxgeal: saliva formation cranial nerve X: Vegus cranial nerve XI: Acessory Spinal: trapizious movement cranial nerve XII: Hypoglosseal: toungue movement
Smiling is an action produce by more than one muscle but the nerve that allows you to do that is the facial nerve (7th cranial nerve). Facial nerve has 5 branches and the action of all 5 allows you to smile nicely. The temporal branch allow you to wrinkle your forehead, the zygomatic branch allows you to partially close your eyes, the buccal branch allow you to elevate your chin, and the marginal mandibular allow you to widen your mouth laterally.
Cranial Nerve 2 - Optic Nerve
The olfactory nerve, or 1st cranial nerve.
Nerve X, Vagus
Cranial nerve II
The vestibulocochlear cranial nerve controls hearing.
The cranial nerve responsible for hearing and equilibrium is vestibulocochlear nerve (CN VIII). It originates from between the pons and medulla.