After releasing, the polypeptide hormones or secretory granules enter easily into cerebrospinal fluid ( CSF) via the perivascular space, interspace of tissue and epithelial openings rather than directly into blood circulation through the walls of blood capillaries. 多肽激素或分泌颗粒释放后,更易经血管周隙-结缔组织间隙-囊上皮孔进入脑脊液发挥旁分泌作用,而非透过毛细血管壁直接进入血液循环。
Between the acinar cells, there are many intercellular secretory capillaries. 腺细胞间存在明显的细胞间分泌小管。