Adrenal gland is derived from

Options

A. Endoderm
B. Ectoderm
C. Mesoderm
D. Ectoderm and mesoderm

Answer

### Step-by-Step Solution:

1. **Understanding the Adrenal Gland**: The adrenal gland, also known as the suprarenal gland, is located on top of each kidney. It has two distinct parts: the cortex and the medulla.

2. **Identifying the Germ Layers**: In embryology, there are three primary germ layers from which all tissues and organs develop: ectoderm, mesoderm, and endoderm.

3. **Cortex Development**: The outer part of the adrenal gland, known as the cortex, is derived from the mesoderm. The mesoderm is the middle germ layer that gives rise to various structures, including muscles, bones, and certain glands.

4. **Medulla Development**: The inner part of the adrenal gland, called the medulla, is derived from the neuroectoderm. The neuroectoderm is associated with the nervous system, particularly the sympathetic nervous system.

5. **Hormonal Function**: The adrenal medulla secretes hormones such as epinephrine (adrenaline), which are crucial during emergency situations, often referred to as the "fight or flight" response.

6. **Conclusion**: Therefore, the adrenal gland is derived from both the mesoderm (for the cortex) and the ectoderm (for the medulla). The correct answer to the question is that the adrenal gland is derived from ectoderm and mesoderm.

### Final Answer:
The adrenal gland is derived from the ectoderm and mesoderm.

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