Which function is associated with the Optic nerve (II)?

Which function is associated with the Optic nerve (II)?

• A. Sense of smell.
• B. Vision.
• C. Taste.
• D. Hearing.

Answer: (B)

Vision is carried by the optic nerve. This nerve, cranial nerve II, is a purely sensory pathway that transmits signals from the retina’s photoreceptors to the brain. Light is detected by rods and cones, converted to electrical signals by retinal neurons, and these signals travel along retinal ganglion cells whose axons form the optic nerve. The information then routes through the visual system to the thalamus and onward to the visual cortex for processing and conscious sight. Other senses don’t use this pathway: smell is carried by the olfactory system, taste by gustatory pathways, and hearing by the auditory/vestibular system via the vestibulocochlear nerve.

Vision is carried by the optic nerve. This nerve, cranial nerve II, is a purely sensory pathway that transmits signals from the retina’s photoreceptors to the brain. Light is detected by rods and cones, converted to electrical signals by retinal neurons, and these signals travel along retinal ganglion cells whose axons form the optic nerve. The information then routes through the visual system to the thalamus and onward to the visual cortex for processing and conscious sight.

Other senses don’t use this pathway: smell is carried by the olfactory system, taste by gustatory pathways, and hearing by the auditory/vestibular system via the vestibulocochlear nerve.