Galíndez E J, Estecondo S
Cátedra de Histologia Animal, Departamento de Biologia, Bioquímica e Farmácia, Universidade Nacional do Sul, Bahía Blanca, Argentina.
Braz J Biol. 2008 May;68(2):359-65. doi: 10.1590/s1519-69842008000200017.
The elasmobranchs constitute an important resource in Argentinian fishing and they show reproductive characteristics that make them susceptible to the pressure of fishing. In spite of the importance of the resource our knowledge about the species of the Southwestern Atlantic is scarce. In this work we study the microanatomy of the oviduct and the oviducal gland of Sympterygia acuta. The results show a very folded oviduct with mucous and ciliated cells. The oviducal gland depicts the same zonation as other batoids, showing the typical four regions (club, papillary, baffle and terminal). The epithelium lining the glandular lumen is simple columnar with ciliated and glandular cells. The four zones show simple or ramified tubular gland the secretions of which constitute the egg's envelopes. The club and baffle zones are similar to those present in other species. The papillary one depicts a different pattern of secretions that other Rajiformes and the last zone of the gland is characterized by mixed adenomers. The information here exposed constitutes the first report on the microanatomy of the genital tract of S. acuta.
板鳃亚纲鱼类是阿根廷渔业的一项重要资源，它们具有一些繁殖特征，这使得它们容易受到捕捞压力的影响。尽管该资源很重要，但我们对西南大西洋物种的了解却很匮乏。在这项研究中，我们对尖吻歧须鲨的输卵管和输卵管腺进行了微观解剖学研究。结果显示，输卵管有很多褶皱，有黏液细胞和纤毛细胞。输卵管腺与其他鲼形目鱼类具有相同的分区，呈现出典型的四个区域（棒状区、乳头状区、隔板区和末端区）。腺腔内衬的上皮为单层柱状，有纤毛细胞和腺细胞。这四个区域有简单或分支的管状腺，其分泌物构成卵的包膜。棒状区和隔板区与其他物种中的类似。乳头状区呈现出与其他鳐形目不同的分泌模式，腺的最后一个区域的特征是混合性腺泡。这里公布的信息是关于尖吻歧须鲨生殖道微观解剖学的首份报告。
