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How does the hypothalamus regulate the pituitary gland?

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Diagram of a human figure showing the full nervous system, including the brain, spinal cord, and branching peripheral nerves throughout the body, with labels for each part. — human nervous system The conduction of electrochemical stimuli from sensory receptors in the human nervous system occurs via organized groups of specialized cells, consisting largely of neurons, various neural support cells, and tracts of nerve fibers.

The hypothalamus regulates the pituitary gland through two distinct pathways involving chemical communication, serving as a critical link between the nervous and endocrine systems.12

Anterior Pituitary Regulation

The hypothalamus controls the anterior pituitary (adenohypophysis) primarily through a vascular route. Specialized neurosecretory cells in the hypothalamus produce releasing hormones (such as thyrotropin-releasing hormone and growth-hormone-releasing hormone) and inhibitory factors (such as dopamine and somatostatin). These substances are discharged into a capillary network at the median eminence and transported via the hypophyseal-portal veins directly to the anterior pituitary, where they stimulate or inhibit the secretion of specific hormones.231

Posterior Pituitary Regulation

The posterior pituitary (neurohypophysis) is regulated through a direct neural pathway. Hormones like oxytocin and vasopressin are synthesized in the hypothalamic nuclei, packaged into granules, and transported down axons through the infundibular stalk. These hormones are stored in nerve terminals within the posterior pituitary and are released into the general circulation in response to neural stimuli.145