Some of the small islets were supplied by the efferent vessels of the adjacent large islets, and the vessels connecting the large and small islets were called insulo insular portal vessels.

• 少数小胰岛无小叶内动脉分支直接供应，而由附近较大胰岛的输出血管供给，这种连接大、小胰岛之间的血管称为胰岛-胰岛门脉血管。