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Tuberoinfundibular pathway shown in opaque blue, connecting that hypothalamus with the pituitary gland. The tuberoinfundibular pathway refers to a population of dopamine neurons that project from the arcuate nucleus (a.k.a. the "infundibular nucleus") in the tuberal region of the hypothalamus to the median eminence. [1]
Specific to the activation of the hypothalamic-pituitary adrenal axis, norepinephrine will stimulate the secretion of corticotropin-releasing factor from the hypothalamus, that induces adrenocorticotropic hormone release from the anterior pituitary and subsequent cortisol synthesis in the adrenal glands. Norepinephrine released from locus ...
This triggers the release of GnRH into the hypophyseal portal capillary bloodstream, where the GnRH hormone activates the pituitary to release luteinizing hormone and follicle stimulating hormone. In addition to classical neurotransmitters, some guidance molecules can change the wiring of GnRH neurons to the portal capillary system, altering ...
The principal examples are hypothalamic-pituitary hormones that can be classified from several viewpoints: they are hypothalamic hormones (originating in the hypothalamus), they are hypophysiotropic hormones (affecting the hypophysis, that is, the pituitary gland), and they are tropic hormones (having other endocrine glands as their target).
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The hypothalamus produces the hormones oxytocin and vasopressin in its endocrine cells (left). These are released at nerve endings in the posterior pituitary gland and then secreted into the systemic circulation. The hypothalamus releases tropic hormones into the hypophyseal portal system to the anterior pituitary (right).
Its main function is the stimulation of the pituitary synthesis of adrenocorticotropic hormone (ACTH), as part of the hypothalamic–pituitary–adrenal axis (HPA axis). Corticotropin-releasing hormone (CRH) is a 41-amino acid peptide derived from a 196-amino acid preprohormone.