Liquori Giuseppa Esterina, Ferri Domenico
Department of Zoology, Laboratory of Histology and Comparative Anatomy, University of Bari, Bari, Italy.
Eur J Morphol. 2002 Feb;40(1):29-35. doi: 10.1076/ejom.40.1.29.13954.
In this study, we describe the ultrastructural features of the external nasal gland in two lizards: ruin lizard (Podarcis sicula campestris) and seps (Chalcides chalcides). Two secretory cell types, which differ interspecifically, have been found in the secretory endpieces of the glandular tubules in both species examined. An unusual morphological observation was the presence of paracrystalline structures in the secretory granules of the seromucous cells of the external nasal gland of the seps. These structures may be related to the packaging mechanism of glycoproteins or to their macromolecular structure. They may also reflect segregation of heterogeneous subcomponents within the same secretory granule. The striated cells are located in the distal segment of the glandular tubules, and have the typical ultrastructural features of the cells which in some species of reptiles, but not in these two lizards, are known to be capable of elaborating a hyperosmotic saline solution.
在本研究中，我们描述了两种蜥蜴——废墟蜥蜴（Podarcis sicula campestris）和塞普斯蜥蜴（Chalcides chalcides）外鼻腺的超微结构特征。在所研究的两个物种的腺管分泌末端中，发现了两种种间存在差异的分泌细胞类型。一个不寻常的形态学观察结果是，在塞普斯蜥蜴外鼻腺的浆液黏液细胞的分泌颗粒中存在类晶体结构。这些结构可能与糖蛋白的包装机制或其大分子结构有关。它们也可能反映了同一分泌颗粒内异质亚组分的分离。横纹细胞位于腺管的远端部分，具有某些爬行动物种中细胞典型的超微结构特征，但在这两种蜥蜴中并非如此，已知这些细胞能够分泌高渗盐溶液。
