Which of the following is sensory layer of retina?
**Core Concept**
The sensory layer of the retina is responsible for converting light into electrical signals that are transmitted to the brain, enabling visual perception. This layer is composed of specialized neurons that detect light and transmit visual information.
**Why the Correct Answer is Right**
The correct answer is the part of the retina that contains photoreceptor cells, including rods and cones. These cells contain photopigments that undergo conformational changes in response to light, leading to the activation of downstream signaling pathways. The photoreceptor cells in the sensory layer of the retina are connected to bipolar cells, which transmit the visual signal to the ganglion cells. The ganglion cells then transmit this information to the optic nerve and eventually to the brain.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the retinal pigment epithelium (RPE) is a layer of pigmented cells that nourish the sensory layer of the retina, but it does not contain photoreceptors.
**Option B:** The optic nerve is the structure that carries visual information from the eye to the brain, but it is not a layer of the retina itself.
**Option C:** The choroid is a layer of blood vessels that supplies the retina with oxygen and nutrients, but it is not a sensory layer.
**Clinical Pearl / High-Yield Fact**
The sensory layer of the retina is responsible for detecting light and transmitting visual information to the brain, but it is also susceptible to damage from conditions such as macular degeneration and retinal detachment.
**Correct Answer: C. The photoreceptor layer, which includes the rods and cones, is the sensory layer of the retina.**