Question

Arrange the flow of information through visual system:
A. Optic tract
B. Lateral geniculate nuclei
C. Primary visual cortex
D. Nasal hemiretinas
E. Optic chiasm
Choose the correct answer from the options given below:

• A. E - A - D - C - B
• B. A - E - B - D - C
• C. D - E - A - B - C
• D. E - D - B - C - A

Hint:

Remember that fibers from the nasal hemiretinas always cross at the optic chiasm, while fibers from the temporal hemiretinas do not cross. The sequential path always ends in the occipital lobe (Primary Visual Cortex).

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
The question asks us to arrange the physiological structures of the human visual pathway in the correct sequence through which light-induced neural signals travel from the eye to the brain.

Step 2: Detailed Explanation:

• Visual phototransduction begins at the retina, where light is captured by photoreceptors.

• D. Nasal hemiretinas: The sensory signal originates in the photoreceptor and ganglion cells of the nasal portion of the retina (nasal hemiretinas).

• E. Optic chiasm: Axons from the nasal hemiretinas travel along the optic nerve and cross over (decussate) to the opposite side of the brain at the optic chiasm.

• A. Optic tract: Once past the optic chiasm, the reorganized fibers are referred to as the optic tract.

• B. Lateral geniculate nuclei: The optic tract fibers travel to and synapse in the lateral geniculate nucleus (LGN) of the thalamus, which serves as the primary visual relay station.

• C. Primary visual cortex: From the LGN, neural impulses travel via optic radiations to the primary visual cortex (striate cortex or area $17$) located in the occipital lobe for conscious visual processing.

• Therefore, the sequential flow of visual information is D $\rightarrow$ E $\rightarrow$ A $\rightarrow$ B $\rightarrow$ C.

Step 3: Final Answer:
The correct flow of information through the visual system is D - E - A - B - C.