The close association of the nervous system with the endocrine system is revealed by the extraordinarily rich vascular supply of individual hypothalamic nuclei. The su-praoptic nucleus (A1) and the paraventricu-lar nucleus (A2) are about six times morevascularized than the rest of the gray mat-ter. Their neurons have close contact with the capillaries, some of which are even en-closed by the neurons (endocellular capil-laries).
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