Abstract
The superior hypophyseal arteries, primary capillaries, and portal trunks of the hypophyseal portal system were studied in more than 150 living albino mice following a standardized operative procedure. Direction of blood flow, vasomotor activity, and changes in linear velocity of blood flow in portal trunks were studied following the administration ofseveral different drugs, the application of several different physical stimuli, and the manipulation of the arterial blood supply and venous return from the brain case. Evidence is presented for the validity of linear velocity in the portal trunksas a rough indicator of total blood flow into the anterior pituitary. The probability that vasomotor activity and variations in portal blood flow affect anteriorpituitary function is discussed. The effects on the superior hypophyseal arteries of adrenergic and cholinergic drugs are described, and the relationships of vascular phenomena to the susceptibility of the anterior pituitary to infarction are considered.
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