Hypophysenvorderlappen

Hypophysenvorderlappen is the German name for the anterior pituitary, the front part of the pituitary gland located at the base of the brain. It develops from Rathke’s pouch, an invagination of the oral ectoderm, and is distinct from the posterior pituitary (neurohypophysis), which stores and releases hormones produced in the hypothalamus.

The anterior lobe contains several endocrine cell types that secrete hormones into the blood via the hypophyseal portal system. Acidophils include somatotrophs, which produce growth hormone (GH), and lactotrophs, which produce prolactin (PRL). Basophils include corticotrophs (adrenocorticotropic hormone, ACTH), thyrotrophs (thyroid-stimulating hormone, TSH), and gonadotrophs (follicle-stimulating hormone, FSH, and luteinizing hormone, LH). Melanocyte-stimulating hormone activity is associated with POMC-derived peptides. The lobe’s hormones regulate growth, metabolism, reproduction, and lactation, among other processes.

Regulation occurs mainly through the hypothalamic-pituitary axis. Releasing and inhibiting hormones produced in the hypothalamus reach the anterior lobe through the hypophyseal portal circulation. Examples include GHRH and somatostatin for GH, TRH for TSH and PRL, GnRH for FSH and LH, and CRH for ACTH; dopamine inhibits PRL secretion.

Clinical relevance includes disorders of the anterior pituitary such as adenomas (for example prolactinomas or GH-secreting tumors), hypopituitarism, and pituitary insufficiency. These conditions can disrupt multiple hormonal pathways and may require endocrinological evaluation and treatment options ranging from medication to surgical intervention.