The correct option is A is false but R is true
Explanation
The relationship between the hypothalamus and the pituitary gland involves two distinct mechanisms of connection: vascular and neural. These connections dictate how hormones are synthesized, transported, and released in the anterior and posterior lobes of the pituitary.
Analysis of the Assertion (A):
Incorrect. The anterior pituitary (adenohypophysis) is not connected to the hypothalamus by a direct neural pathway. Instead, it is connected via a vascular link known as the hypophyseal portal system. Hypothalamic releasing and inhibiting hormones are transported through this blood vessel system to regulate the anterior pituitary. It is the posterior pituitary (neurohypophysis) that is directly connected to the hypothalamus by a neural pathway.
Analysis of the Reason (R):
Correct. The posterior pituitary does not synthesize its own hormones. It acts as a storage and release center for hormones-specifically Oxytocin and Vasopressin (ADH)-that are actually synthesized by the neurosecretory cells of the hypothalamus. These hormones travel down the axons of neurons to be stored in the posterior pituitary until a signal triggers their release.
Key Takeaway:
The anterior pituitary is connected to the hypothalamus via the hypophyseal portal system (blood vessels) and synthesizes its own hormones. The posterior pituitary is connected via neurons and only stores/releases hormones synthesized by the hypothalamus.