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The hypophysial blood flow was studied in rats with the aid of an 86Rb technique 2 days and 4 weeks after destruction of the pituitary stalk by electrocautery. Centrally located infarcts develop in the anterior lobe after interruption of the pituitary stalk; fibrotic scar tissue may be observed in the necrotic area 4 weeks later. The neural lobe atrophies. The uptake of 86Rb to the surviving anterior pituitary tissue does not decrease significantly. The minute volume fraction of the posterior pituitary decreases but the blood flow per mg of tissue does not change significantly. It appears that hypofunction of the anterior pituitary developing after the stalk lesion cannot be due to a decreased blood flow to the surviving parenchyma but possibly to changes in composition of the blood (less mediators, etc.). (Endocrinology77: 183, 1965)
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Dávid et al. (1965) studied this question.
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