Dilator pupillae develops from ?
**Core Concept**
The development of the eye involves the formation of various structures, including the iris, from neuroectoderm. The **dilator pupillae muscle** plays a crucial role in regulating pupil size.
**Why the Correct Answer is Right**
The **dilator pupillae** develops from the **neuroectoderm**, specifically from the ectoderm of the optic cup. This muscle is responsible for dilating the pupil and is controlled by the sympathetic nervous system. The development of this muscle is closely related to the formation of the iris and the optic cup.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not related to the development of the dilator pupillae.
**Option B:** Incorrect as it does not accurately describe the origin of the dilator pupillae.
**Option C:** Incorrect because the dilator pupillae does not develop from this structure.
**Clinical Pearl / High-Yield Fact**
The **dilator pupillae** is crucial for the regulation of light entry into the eye, and its dysfunction can lead to abnormalities in pupil size and reactivity.
**Correct Answer:** D. Neuroectoderm.