The posterior pituitary is under the

Options

A. 1)direct neural regulation of the adenohypophysis
B. 2)direct neural regulation of the hypothalamus
C. 3)direct axonal regulation of the adenohypophysis
D. 4)direct axonal regulation of the neurohypophysis

Answer

To answer the question "The posterior pituitary is under the," we need to analyze the relationship between the posterior pituitary gland and the hypothalamus. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Structure of the Pituitary Gland
The pituitary gland is often referred to as the "master gland" because it regulates various endocrine functions. It is divided into two main parts:
- Anterior pituitary (adenohypophysis)
- Posterior pituitary (neurohypophysis)

**Hint:** Remember the two parts of the pituitary gland and their names.

### Step 2: Regulation of the Anterior and Posterior Pituitary
The anterior pituitary is regulated indirectly by the hypothalamus through releasing and inhibitory hormones. In contrast, the posterior pituitary is directly regulated by the hypothalamus.

**Hint:** Differentiate between the regulation of the anterior and posterior pituitary glands.

### Step 3: Identify the Nature of Regulation
The posterior pituitary receives direct neural signals from the hypothalamus. This means that the hypothalamus communicates with the posterior pituitary through nerve fibers, allowing for the direct release of hormones such as oxytocin and vasopressin (ADH).

**Hint:** Focus on the type of communication between the hypothalamus and the posterior pituitary.

### Step 4: Analyze the Options
Now, let’s evaluate the options provided in the question:
1. Direct neural regulation of the adenohypophysis (anterior pituitary) - Incorrect.
2. Direct neural regulation of the hypothalamus - Incorrect.
3. Direct axonal regulation of the adenohypophysis - Incorrect.
4. Direct axonal regulation of the neurohypophysis (posterior pituitary) - Correct.

**Hint:** Cross-check each option with the information about the regulation of the pituitary glands.

### Step 5: Conclusion
The correct answer is that the posterior pituitary (neurohypophysis) is under direct axonal regulation of the hypothalamus.

**Final Answer:** The posterior pituitary is under the direct axonal regulation of the hypothalamus.