Anaya-López Paola, Ramírez-Pinilla Martha Patricia
Laboratorio de Biología Reproductiva de Vertebrados, Escuela de Biología, Grupo de Estudios en Biodiversidad, Universidad Industrial de Santander, Bucaramanga, Colombia.
J Morphol. 2017 Mar;278(3):369-379. doi: 10.1002/jmor.20647. Epub 2017 Jan 23.
Clasper gland morphology and development in Potamotrygon magdalenae and its relation with the acquisition of reproductive maturity is described in males of different developmental stages (embryos, neonates, juveniles, and reproductively active and resting adults). The glands are subcutaneous masses in the proximal base of each clasper. They are partially bilobate organs with a ventral groove that bears a row of papillae. Glands tend to be asymmetric, the left gland has a larger size, a trend that has been observed in other organs of elasmobranchs. Glands are formed by radially organized tubular secretory units lined with a simple columnar epithelium with basal nuclei and granular eosinophilic cytoplasm; vascularized loose connective tissue surrounds the gland units. The gland is covered by two layers of striated muscle tissue in circular and longitudinal arrangement. The clasper glands begin to develop in neonates and their secretory activity begins in juveniles. The active secretion of the clasper gland is observed in mature males, it includes glycoproteins and sulfated mucopolysaccharides. The size of the glands has a positive and direct relationship with body size, measured as disc width. Significant differences in clasper gland size were found between mature (active and resting) and immature (neonates and juveniles) males, suggesting that the acquisition of the sexual maturity involves the increase in the size of the gland due to a highly augmented secretory activity. Therefore, clasper glands are clearly associated with the reproductive activity of males and their secretion should have an endocrine control as other sexual secondary organs. J. Morphol. 278:369-379, 2017. © 2017 Wiley Periodicals, Inc.
描述了不同发育阶段（胚胎、幼体、幼鱼以及繁殖活跃和静止的成体）的马格达莱纳河江魟雄鱼的鳍脚腺形态和发育情况，及其与生殖成熟获得的关系。这些腺体是每个鳍脚近端基部的皮下肿块。它们是部分双叶状器官，有一条带有一排乳头的腹侧沟。腺体往往不对称，左腺较大，这种趋势在其他板鳃亚纲动物的器官中也有观察到。腺体由呈放射状排列的管状分泌单位组成，内衬单层柱状上皮，有基底核和嗜酸性颗粒状细胞质；血管化的疏松结缔组织围绕着腺体单位。腺体被两层呈环形和纵向排列的横纹肌组织覆盖。鳍脚腺在幼体中开始发育，其分泌活动在幼鱼中开始。在成熟雄鱼中观察到鳍脚腺的活跃分泌，其分泌物包括糖蛋白和硫酸化粘多糖。腺体大小与以圆盘宽度衡量的体型呈正相关且直接相关。在成熟（活跃和静止）和未成熟（幼体和幼鱼）雄鱼之间发现鳍脚腺大小存在显著差异，这表明性成熟的获得涉及由于分泌活动大幅增加导致的腺体大小增加。因此，鳍脚腺显然与雄鱼的生殖活动相关，并且其分泌应该像其他性附属器官一样受到内分泌控制。《形态学杂志》278:369 - 379, 2017。© 2017威利期刊公司。
