Optic cup is derived from –
**Core Concept**
The optic cup is a critical structure in the development of the eye, specifically the retina. It is formed during embryonic development through a complex process involving the invagination of the optic vesicle, a precursor to the eye.
**Why the Correct Answer is Right**
During embryonic development, the optic vesicle invaginates to form the optic cup, which eventually gives rise to the retina. This process is mediated by the expression of specific transcription factors and the interaction between the optic vesicle and the overlying surface ectoderm. The optic cup is composed of two layers: the inner neuroblastic layer, which gives rise to the neural retina, and the outer pigmented layer, which gives rise to the retinal pigment epithelium.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the optic cup is not derived from the lens vesicle, which is a separate structure that forms from the optic vesicle but gives rise to the lens of the eye.
* **Option B:** This option is incorrect because the optic cup is not derived from the ciliary body, which is a structure that forms from the optic vesicle but is responsible for lens accommodation and aqueous humor production.
* **Option C:** This option is incorrect because the optic cup is not derived from the choroid, which is a structure that forms from the mesenchyme surrounding the optic cup and is responsible for supplying the retina with oxygen and nutrients.
**Clinical Pearl / High-Yield Fact**
The optic cup is a critical structure in the development of the eye, and abnormalities in its formation can lead to a range of ocular disorders, including microphthalmia and coloboma.
**Correct Answer: D. The optic cup is derived from the invagination of the optic vesicle.**