## **Core Concept**
The optic pathway involves a series of neurons that transmit visual information from the eye to the brain. The pathway starts from the retina, where the first-order neurons are located, and proceeds through the optic nerve, optic chiasm, optic tract, lateral geniculate body, and finally to the visual cortex. The first-order neurons in this pathway are responsible for converting light into electrical signals.

## **Why the Correct Answer is Right**
The correct answer, **B. Retinal ganglion cells**, refers to the retinal bipolar cells and retinal ganglion cells are not correct however bipolar cells synapse with ganglion cells. The first-order neurons in the visual pathway are actually the **photoreceptor cells (rods and cones)** in the retina. However among the provided options and in a strict sense **retinal ganglion cells** are not first order but their axons are part of the optic nerve. First order neurons are **photoreceptors**.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not accurately represent the first-order neurons in the optic pathway.
- **Option C:** and **Option D:** are similarly incorrect as they do not accurately describe the first-order neurons.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the first-order neurons in the optic pathway are the **photoreceptors (rods and cones)** in the retina. Damage to these cells can lead to visual loss.

## **Correct Answer:** . Photoreceptors (rods and cones).