Structure which develop from neural crest are/is;
**Core Concept**
The neural crest is a critical region in the embryonic development of vertebrates, giving rise to a diverse array of cell types and tissues. These cells migrate to various parts of the body, differentiating into various structures that contribute to the formation of the nervous system, cardiovascular system, and other tissues.
**Why the Correct Answer is Right**
The neural crest cells play a pivotal role in the development of various structures, including the adrenal medulla, which is derived from the neural crest. This is due to the presence of neural crest-specific transcription factors, such as Sox10, that regulate the expression of genes involved in neural crest development. The adrenal medulla is responsible for producing catecholamines, such as epinephrine and norepinephrine, which are crucial for the body's "fight or flight" response.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the neural crest does not give rise to the pituitary gland, which is derived from the diencephalon. While the neural crest does contribute to the development of the pharyngeal arches, which in turn give rise to various structures, including the facial skeleton and muscles, the pituitary gland is not one of them.
**Option B:** This option is incorrect because the neural crest does not give rise to the pancreas, which is derived from the endoderm. The pancreas is responsible for producing hormones such as insulin and glucagon, which regulate blood sugar levels.
**Option C:** This option is incorrect because the neural crest does not give rise to the liver, which is also derived from the endoderm. The liver plays a crucial role in detoxification, metabolism, and the production of bile.
**Clinical Pearl / High-Yield Fact**
The neural crest cells also contribute to the development of the autonomic nervous system, which regulates various involuntary functions, such as heart rate and digestion. Understanding the embryonic origin of these cells can help clinicians diagnose and manage disorders related to the autonomic nervous system.
**Correct Answer: D. Adrenal medulla**