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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。
Objectives; To provide the necessary morphological basis for the comparison of the ultrastructure of pineal gland and the related research. Methods: Using light and electron microscopy. Results: Alligator pineal gland has evolved into a substantial gland, the essence of which is mainly composed of glandular cells, gland cells larger, more protrusions, the nucleus was round, oval, or irregular, less heterochromatin and Near the nuclear membrane. Low electron density of the cytoplasm is rich in Golgi complex, rough endoplasmic reticulum and smooth endoplasmic reticulum. Clear vesicles and mitochondria are more common, occasionally lipid droplets, lysosomes, centrioles, microtubules, microfilaments and membrane-like structure. Interstitial capillaries more abundant, occasional glial cells. Conclusion: The amphibians and reptiles - alligator indeed pineal gland exist, the pineal gland has evolved into a substantial gland.