胰岛(pancreatic islet)又称朗格汉斯岛[1](德语:Langerhans-Inseln、英语:islet of Langerhans),是胰脏里的球形细胞团,零散分布于胰脏外分泌部腺泡之间而状似孤岛,其结构由一群分泌激素的细胞(内分泌细胞)所组成,因德国病理学家保罗·兰格尔翰斯(Paul Langerhans)1869年发现而得名。
胰岛的直径介于50-500μm之间,每个胰岛含有大约1000个细胞。
胰岛内有5种分泌激素的细胞:
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