电镜细胞化学实验结果表明，在睾丸间质细胞中早期内体在形态上表现为一种形状不规则的低密度多泡体，其管状突起可能含有回收到细胞表面的受体。晚期内体在形态上表现为高密度多泡体，接受来自高尔基体的含有溶酶体的运输小泡，呈不同程度的ＣＭＰ酶阳性反应，最后成熟成为溶酶体 Electron microscopy cytochemistry results showed that the early endosome in the early stage of testicular stromal cells showed an irregular shape of low-density multi-foam body, the tubular protrusions may contain receptors recovered to the cell surface. Late endosomes are morphologically characterized by a high density of multiphosphates, which accept lysosomal transport vesicles from the Golgi apparatus with varying degrees of positive for CMP enzyme and eventually mature into lysosomes