Which endocrine gland is involved in regulation of pigmentation by secreting Melanocyte stimulating hormone (MSH) ? 

Options

A. anterior pituitary
B. posterior pituitary
C. pars intermedia of pituitary
D. parathyroid

Explanation

To answer the question regarding which endocrine gland is involved in the regulation of pigmentation by secreting Melanocyte Stimulating Hormone (MSH), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Role of Hormones in Pigmentation**:
- The regulation of skin pigmentation is primarily influenced by hormones, particularly Melanocyte Stimulating Hormone (MSH).

2. **Locate the Source of MSH**:
- MSH is not produced directly by the hypothalamus. Instead, it is released from the pituitary gland.

3. **Understand the Function of the Hypothalamus**:
- The hypothalamus produces a releasing hormone known as Melanocyte Stimulating Hormone Releasing Hormone (MSH-RH). This hormone stimulates the pituitary gland to release MSH.

4. **Identify the Specific Part of the Pituitary Gland**:
- MSH is secreted from the middle lobe of the pituitary gland, also known as the pars intermedia.

5. **Connect MSH to Its Function**:
- Once released, MSH acts on melanocytes in the skin, which are responsible for producing melanin, the pigment that determines skin color.

6. **Conclude with the Correct Answer**:
- Therefore, the endocrine gland involved in the regulation of pigmentation by secreting MSH is the **pituitary gland**.

### Final Answer:
The endocrine gland involved in the regulation of pigmentation by secreting Melanocyte Stimulating Hormone (MSH) is the **pituitary gland**.

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