Regulating hormones from hypothalamus reach adenohypophysis through

Options

A. Neuron
B. Neuroendocrine cells
C. Portal blood vessel
D. Diffusion

Answer

To solve the question "Regulating hormones from hypothalamus reach adenohypophysis through," we will analyze the options provided and understand the mechanism involved in hormone transport from the hypothalamus to the adenohypophysis (anterior pituitary).

### Step-by-Step Solution:

1. **Understanding the Hypothalamus and Pituitary Gland**:
- The hypothalamus is a crucial part of the brain that synthesizes and secretes hormones that regulate various bodily functions. It communicates with the pituitary gland, which is divided into two lobes: the anterior lobe (adenohypophysis) and the posterior lobe (neurohypophysis).

2. **Hormone Transport Mechanism**:
- Hormones produced in the hypothalamus are transported to the pituitary gland. The method of transport differs between the anterior and posterior lobes of the pituitary gland.

3. **Posterior Pituitary (Neurohypophysis)**:
- In the case of the posterior pituitary, hormones are transported via axons of neurosecretory cells. These hormones are released into the bloodstream through diffusion at the axon terminals.

4. **Anterior Pituitary (Adenohypophysis)**:
- For the anterior pituitary, the hormones do not enter directly. Instead, they are released into the portal blood vessels (also known as the hypophyseal portal system). This system consists of a network of capillaries that connect the hypothalamus to the anterior pituitary.

5. **Evaluating the Options**:
- **Neuron**: This is incorrect as neurons are not the direct transport medium for hormones to the adenohypophysis.
- **Neuroendocrine cells**: This is also incorrect as these cells are involved in the release of hormones but do not serve as the transport medium to the adenohypophysis.
- **Portal blood vessels**: This is correct as the hormones from the hypothalamus reach the adenohypophysis through the portal blood vessels.
- **Diffusion**: This is incorrect for the adenohypophysis as it pertains to the posterior pituitary.

6. **Conclusion**:
- The correct answer is that regulating hormones from the hypothalamus reach the adenohypophysis through **portal blood vessels**.

### Final Answer:
Regulating hormones from the hypothalamus reach the adenohypophysis through **portal blood vessels**.