Cranial nerves are a set of 12 pairs of nerves that originate in the brain and control various functions of the body. The OPTIC nerve, which is 5 letters long, is responsible for vision. The vagus nerve, also 5 letters long, is responsible for controlling the heart rate and digestion. The iter nerve, 4 letters long, is responsible for facial sensation. The basial nerve, 6 letters long, is responsible for controlling the muscles of the face. The IDEA nerve, 4 letters long, is responsible for controlling the muscles of the tongue. The SINUS nerve, 5 letters long, is responsible for controlling the muscles of the neck. Finally, the dura nerve, 4 letters long, is responsible for controlling the muscles of the scalp.