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HYPOTHALAMUS AND ITS HORMONES HORMONES OF THE PITUITARY Jana Jurcovicova HYPOTHALAMUS Part of the limbic system where neural and humoral regulations integrate It extends between: - mammilary bodies (caudally) - optic chiasm (frontally) - optic tract (laterally) - thalamus (dorsally) In its medial part there are clusters of cell bodies of nerve cells producing peptidergic hormones regulating adenopituitary secretion BASAL VIEW OF THE HYPOTHALAMUS SCHEMATIC DRAWING OF HYPOTHALAMIC NUCLEI AC: anterior commissure PO: preoptic nucleus SC: suprachiasmatic nucleus OC: optic chiasma TC: tuber cinereum AP: anterior pituitary IN: infundibulum: posterior pituitary ME: median eminence AH: anterior hypothalamic nucleus SO: supraoptic nucleus TH: thalamus PV: paraventricular nucleus (not to be confused with periventricular nucleus, which is not shown) DM: dorsomedial nucleus VM: ventromedial nucleus AR: arcuate nucleus (associated with periventricular nucleus, which is not shown) LT: lateral nucleus PN: posterior nucleus MB: mamillary body SCHEMATIC CROSS SECTION OF HYPOTHALAMUS suprachiasmatic Guyton and Hall, 2006 Ganong and Hall, 2006 CROSS-SECTION OF THE ROSTRO - MEDIAL PART OF THE BRAIN CROSS- SECTION OF THE MIDDLE PART OF THE BRAIN HISTOCHEMICAL STAINING OF HYPOTHALAMIC NUCLEI HYPOTHALAMO-PITUITARY REGULATION DEVELOPMENT AND STRUCTURE OF PITUITARY diencephalon Rathke’s pouch of pharynx neural tissue ectoderm pars tuberalis pars distalis pars nervosa anterior posterior pars intermedia HYPOTHALAMO – PITUITARY CONNECTION PRL - ; + GH +; - ACTH + TSH + FSH + LH + INNERVATION OF ANTERIOR AND POSTERIOR PITUITARY BY NEURONES OF PARAVENTRICULAR AND SUPRAOPTIC NUCLEI HYPOTHALAMIC CONTROL OF POSTERIOR PITUITARY SECRETION Guyton and Hall, 2006 STRUCTURES OF ARGININE VASOPRESSIN AND OXYTOCIN HYPOTHALAMO - PITUITARY SYSTEM Nc. paraventricularis Nc. supraopticus Hypothalamic neurons secreting releasing, inhibiting hormones (nuclei:nARC, mPOA NPE) p ** arvoce llu m la ag r no ce llu la r Primary capilary plexus Chiasma opticum Neural lobe Portal vein Adenopituitary Anterior lobe Secretory cells Oxytocin Vasopresin ACTH, GH, TSH, LH, FSH, Prolactin HYPOTHALAMIC HORMONES SECRETED HORMONE abbr Thyrotrophic-releasing hormone (Prolactin-releasing hormone) TRH, PRH Parvocellular neurosecretory neurons Stimulate thyroid-stimulating hormone (TSH) release from anterior pituitary (primarily) Stimulate prolactin release from anterior pituitary Dopamine (Prolactin-inhibiting hormone) DA or PIH Dopamine neurons of the arcuate nucleus Inhibit prolactin release from anterior pituitary Growth hormone-releasing hormone GHR H Neuroendocrine neurons of the Arcuate nucleus Stimulate Growth hormone (GH) release from anterior pituitary Somatostatin (growth hormone-inhibiting hormone) SS, GHI H, or SRIF Neuroendocrine cells of the Periventricular nucleus Inhibit Growth hormone (GH) release from anterior pituitary Inhibit thyroid-stimulating hormone (TSH) release from anterior pituitary Gonadotropin-releasing hormone GnR H or LHR H Neuroendocrine cells of the Preoptic area Stimulate follicle-stimulating hormone (FSH) release from anterior pituitary Stimulate luteinizing hormone (LH) release from anterior pituitary Corticotropin-releasing hormone CRH Parvocellular neurosecretory neurons Stimulate adrenocorticotropic hormone (ACTH) release from anterior pituitary Magnocellular neurosecretory cells Uterine contraction Lactation (letdown reflex) Magnocellular neurosecretory neurons Increase in the permeability to water of the cells of distal tubule and collecting duct in the kidney and thus allows water reabsorption and excretion of concentrated urine Oxytocin Vasopressin (antidiuretic hormone) ADH or AVP PRODUCED BY EFFECT LIST OF PITUITARY HORMONES STRUCTURE OF PROOPIOMELANOCORTIN PC1 – PROHORMONE CONVERTASE1 PC2 – PROHORMONE CONVERTASE2 REGULATION OF HYPOTHALAMIC HORMONES BY SHORT LOOP AND ULTRASHORT LOOP FEEDBACK FEEDBACK REGULATION OF ADENOPITUITARY HORMONES THE ENDOCRINE HYPOTHALAMUS IS RESPONSIVE TO: Neural inputs transmitted information - arising in particular from higher CNS centers Blood-borne stimuli - including leptin, ghrelin, insulin, pituitary hormones, cytokines, plasma concentrations of glucose, osmolarity, steroids (gonadal steroids and corticosteroids) Light - daylength and photoperiod for synchronizing of circadian rhythms Stress - Invading microorganisms by increasing body temperature, resetting the body's thermostat upward. NEURAL STIMULI OF THE HYPOTHALAMUS NEURON synaptic buttons myelin Ranvier cleft axon dendrites oligodendroglia nucleus mitochondrion vesicles with mediator exocytosis synapse postsynaptci receptots NEUROTRANSMITER SYSTEMS REGULATING HYPOTHALAMIC SECRETION v ERROR: ioerror OFFENDING COMMAND: image STACK: