Abstract
Publisher Summary This chapter discusses vascular communications between the brain and the anterior pituitary gland. While the main direction of blood flow provides the transport of humoral factors from the brain to the pituitary gland, retrograde channels for blood from both the median eminence (ME) and the anterior pituitary gland to the medial basal hypothalamus (MBH) are also consistent factors of the functional link existing between the hypothalamus and the adenohypophysis. The hypophysiotrophic hormones released in the ME partly flow back to the MBH, and the hypophysiotrophic effect of the hypophysiotrophic area (HTA) is mediated by the collateral circulation of the pituitary portal system. Hypophysiotrophic and pituitary hormones carried back into the MBH act in ultrashort and short feedback loops, respectively. The HTA can be the major site of production of the releasing and inhibiting hormones. The direct contact of the HTA with the LH–RH system cannot be the decisive factor responsible for the maintenance of the secretory activity of the gonadotroph cells in the grafts.
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