The optic nerve.
The second cranial nerve is the optic nerve.
The optic nerve, also known as cranial nerve II, originates in the back of the eye, specifically at the retina.
The optic nerve (cranial nerve II) is not involved in taste, as its primary function is vision. Taste is primarily mediated by the facial nerve (cranial nerve VII), glossopharyngeal nerve (cranial nerve IX), and vagus nerve (cranial nerve X).
The olfactory bulbs [I] and the optic nerve [II]
The corneal reflex will not test for injuries to the facial nerve (cranial nerve VII) as it primarily assesses the integrity of the trigeminal nerve (cranial nerve V) and the ophthalmic branch of the trigeminal nerve.
Optic Nerve (Cr. N. II)
The optic nerve, or cranial nerve II, is responsible for visual functioning and carries visual information from the eyes to the brain.
The only two cranial nerves that are completely sensory are the olfactory nerve (I) for smell and the optic nerve (II) for vision.
The trigeminal nerve (cranial nerve V) carries sensory information to the diencephalon. It is responsible for transmitting sensory information from the face, including touch, temperature, and pain sensations.
vestibulocochlear nerve
The Optical nerver or the Second Cranial nerve controls and relays information absorbed through the rods and cones of the eye. Eye movements (eye muscles), however, are controlled by several other cranial nerves including the Oculomotor, Abducens, and Trochlear nerves.
Neuropathy can affect the brain. It can damage the cranial nerves that lead out of the brain. The cranial nerves, except for cranial nerve II which is the optic nerve, are a part of the peripheral nervous system.