Trace the pathway of nerve impulses from the photoreceptors in the retina to the visual cortex of the brain?

Answer 1

The rods and the cones transduce light waves into neural impulses that pass from the bipolar cells to the ganglion cells, whose axons from the optic nerve beyond the retinal wall of each eye. At the optic chiasm, the two optic nerves come together, and some of the nerve fibers from each eye cross to the opposite side of the brain. They synapse with neurons in the thalamus, which transmit the neural impulses to the primary visual cortex.

Answer 2

Light travels through the cornea to the aqueous humor, from the aqueous humor to the pupil, from the pupil to the lens, from the lens to the vitreous humor, and finally to the rods and cones of the retina.

From the retina, the message is carried via the optic nerve, to the optic chiasma, and finally the optic tract. The optic tract delivers the message to the primary visual cortex of the occipital lobe.

Answer 3

Retina > Optic Nerve (the 2nd Cranial Nerve) > Optic Chiasma (Change over of Left half of retinal image of both eyes to left and right half of retinal image of both eye to right side) > Lateral Geniculate Nucleus in the mid-brain > Optic radiation > Visual cortex

Answer 4

You can better understand the same from diagram. Visual signals from the retina go via optic nerve. One optic nerve from each eye. In the brain, the fibres from nasal side of retina cross to opposite side of the brain. They crosses at optic chiasm. Fibres from temporal side do not cross and go to the same side of the brain. This tract is called as optic tract. This way the fibres from left side of the retinas go to left side of the brain. Fibres from right side of the retinas goes to right side of the brain.

Answer 5

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