Which gland does not originate from embryonic Endoderm?

Options

A. Thymus
B. Parathyroid
C. Adrenal Cortex
D. Thyroid

Answer

To determine which gland does not originate from the embryonic endoderm, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Embryonic Layers**:
- The human embryo has three primary germ layers: ectoderm, mesoderm, and endoderm.
- The endoderm primarily gives rise to the inner linings of the digestive tract and associated organs, including certain glands.

2. **Analyzing the Options**:
- **Option 1: Thymus**
- The thymus gland is responsible for the maturation of T-cells and originates from the endoderm. Therefore, this option is incorrect.

- **Option 2: Parathyroid**
- The parathyroid glands, which regulate calcium levels in the blood, also originate from the endoderm. Thus, this option is incorrect as well.

- **Option 3: Adrenal Cortex**
- The adrenal cortex, which produces hormones such as cortisol and aldosterone, originates from the mesoderm. This is the correct answer since it does not arise from the endoderm.

- **Option 4: Thyroid**
- The thyroid gland, which produces hormones like thyroxine, originates from the endoderm. Hence, this option is also incorrect.

3. **Conclusion**:
- After analyzing all the options, the gland that does not originate from the embryonic endoderm is the **Adrenal Cortex** (Option 3).

### Final Answer:
The gland that does not originate from embryonic endoderm is the **Adrenal Cortex**.

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