Which lobe of the pituitary gland secretes melanocyte stimulating hormone?

Options

A. Anterior lobe
B. Intermediate lobe
C. Posterior lobe
D. Both (a) and (b)

Explanation

To determine which lobe of the pituitary gland secretes melanocyte-stimulating hormone (MSH), we can analyze the functions of each lobe of the pituitary gland.

### Step-by-Step Solution:

1. **Identify the Lobes of the Pituitary Gland**: The pituitary gland has three main lobes: the anterior lobe, the intermediate lobe, and the posterior lobe.

2. **Examine the Anterior Lobe**: The anterior lobe secretes several hormones, including:
- Follicle Stimulating Hormone (FSH)
- Luteinizing Hormone (LH)
- Adrenocorticotropic Hormone (ACTH)
- Thyroid Stimulating Hormone (TSH)
- Prolactin
- Endorphins
- Growth Hormone

Since melanocyte-stimulating hormone is not listed among these, the anterior lobe does not secrete MSH.

3. **Examine the Intermediate Lobe**: The intermediate lobe of the pituitary gland is responsible for secreting melanocyte-stimulating hormone (MSH). This hormone plays a crucial role in the regulation of skin pigmentation and can also influence appetite.

4. **Examine the Posterior Lobe**: The posterior lobe secretes hormones such as oxytocin and vasopressin (also known as antidiuretic hormone). MSH is not produced in this lobe.

5. **Evaluate the Options**:
- **Option A**: Anterior lobe - Incorrect
- **Option B**: Intermediate lobe - Correct
- **Option C**: Posterior lobe - Incorrect
- **Option D**: Both A and B - Incorrect

6. **Conclusion**: The correct answer is that the intermediate lobe of the pituitary gland secretes melanocyte-stimulating hormone.

### Final Answer:
The intermediate lobe of the pituitary gland secretes melanocyte-stimulating hormone (MSH).