扬子鳄松果腺的超微结构

STUDY ON ULTRASTRCTURE OF PINEAL GLAND IN ALLIGATOR SINENSIS

目的；为不同种系松果腺超微结构的比较及有关方面的深入研究提供必要的形态学依据。方法：采用光、电镜观察。结果：扬子鳄松果腺已进化成实质性腺体，其实质主要由腺细胞构成，腺细胞体积较大，突起较多，核呈圆形、卵圆形、或不规则形，异染色质较少且靠近核膜。低电子密度的胞浆内含有丰富的高尔基复合体、粗面内质网及滑面内质网。清亮小泡及线粒体亦较多见，偶见脂滴、溶酶体、中心粒、微管、微丝及膜层样结构。间质内毛细血管较丰富，偶见神经胶质细胞。结论：两栖爬行类动物──扬子鳄确有松果腺存在，其松果腺已进化成实质性腺体。

To provide a morphological basis for the further research and comparison of the ultrastructure of the pineal gland in different species of alligator sinensis. Methods: Light and transmission electron microscope. Results: The pineal gland of alligator sinensis has evolved into a substantial gland. The pinealocyte constituted the major cellular component of the pineal gland of alligator sinensis. Glial cells were occasionally present. Pinealocytes were generally irregularly shaped with a varying number of cytoplasmic processes emerging from those cell bodies. The nucleus was big and usually round or oval or irregular in shape with a varying number of cytoplasmic invaginations. There was little heterochromatin near the nucleus membrane. The gland was mainly composed of low-density parenchymal cells, which contained an abundance of Golgi complexes round endoplasmic reticulam, smooth endoplasmic reticulam. Clean and dense-core vesicles, mitochondria, lipid droplets, centroles, microtubes and microfilaments were also present. Conclusion: Amphibious crawl animal-alligator sinensis proves to have real pineal gland, which has evolved into a substantial gland.