Endocrinology | Hypothalamus: Anterior Pituitary Connection

In this endocrine physiology lecture, Professor Zach Murphy breaks down the critical connection between the hypothalamus and the anterior pituitary (adenohypophysis), highlighting how the brain regulates hormone secretion through a finely tuned network of releasing and inhibiting hormones. We begin by exploring the hypothalamic‑pituitary portal system, which allows hypothalamic neurosecretory cells to deliver hormones directly to the anterior pituitary via a specialized capillary network. This system enables precise control over the secretion of TSH, ACTH, LH, FSH, GH, and prolactin. You’ll learn about the hypothalamic hormones—such as TRH, CRH, GnRH, GHRH, somatostatin, and dopamine—and how they stimulate or inhibit target cells in the anterior pituitary. The lecture emphasizes negative feedback mechanisms, pulsatile hormone release, and the hierarchical structure of endocrine axes (e.g., HPA, HPT, HPG).