Nerves which emerge from the brain region are known as cranial nerves. Cranial nerves are completely different from spinal nerves. Spinal nerves are those nerves which emerge from spinal cord segments. Traditionally, there are twelve pairs of cranial nerves present in the human body. The first and second pair of cranial nerve emerges from the region of cerebrum and rest of ten pairs emerges from region of brainstem. There are following twelve cranial nerves present in the humans and non-human vertebrates: 1.     Olfactory 2.     Optic 3.     Oculomotor 4.     Trochlear 5.     Trigeminal 6.     Abducens 7.     Facial 8.     Auditory or Vestibulocochlear 9.     Glossopharyngeal 10. Vagus 11. Spinal Accessory 12. Hypoglossal Olfactory: Olfactory is a purely sensory nerve and originates from telencephalon. Olfactory n...