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Schematic of the HPA axis (CRH, corticotropin-releasing hormone; ACTH, adrenocorticotropic hormone) Hypothalamus, pituitary gland, and adrenal cortex The hypothalamic–pituitary–adrenal axis (HPA axis or HTPA axis) is a complex set of direct influences and feedback interactions among three components: the hypothalamus (a part of the brain located below the thalamus), the pituitary gland (a ...
release of aldosterone from adrenal cortex dipsogen. 16 Antidiuretic hormone (or vasopressin, arginine vasopressin) ADH Peptide: posterior pituitary: Parvocellular neurosecretory neurons in hypothalamus Magnocellular neurosecretory cells in posterior pituitary: AVPRs, VACM-1: Renal tubules of nephrons of Kidneys (mainly) reabsorption of water ...
The adrenal cortex is the outer region and also the largest part of the adrenal gland. It is divided into three separate zones: zona glomerulosa, zona fasciculata and zona reticularis. Each zone is responsible for producing specific hormones. It is also a secondary site of androgen synthesis. [2]
If the corticotropes underproduce ACTH this can result in secondary adrenal insufficiency, causing the adrenal glands to underproduce cortisol. This can be caused by tumors of the anterior pituitary or hypothalamus, inflammation, or surgery. [19] This ultimately results in the underproduction of cortisol, which has many detrimental symptoms.
Diseases classified as primary adrenal insufficiency (including Addison's disease and genetic causes) directly affect the adrenal cortex. If a problem that affects the hypothalamic–pituitary–adrenal axis arises outside the gland, it is a secondary adrenal insufficiency.
In humans and other animals, the adrenocortical hormones are hormones produced by the adrenal cortex, the outer region of the adrenal gland.These polycyclic steroid hormones have a variety of roles that are crucial for the body's response to stress (for example, the fight-or-flight response), and they also regulate other functions in the body.
The major glands of the endocrine system include the pineal gland, pituitary gland, pancreas, ovaries, testicles, thyroid gland, parathyroid gland, hypothalamus and adrenal glands. The hypothalamus and pituitary glands are neuroendocrine organs. [1] Endocrine glands in the human head and neck and their hormones
The hypothalamus uses dopamine as a prolactostatin to tell the pituitary to inhibit prolactin; it is also created elsewhere in the brain and the adrenal cortex as a neurotransmitter to affect many other systems. The hypothalamus uses RFRP-3 in mammals or GnIH in avian species to inhibit GnRH.
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