Excurrent duct system of the male turtle Chrysemys picta
Excurrent duct system of the male turtle Chrysemys picta
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DOI：
10.1002/jmor.10251
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发表时间：
2004-09-01
影响因子：
1.5
通讯作者：
Gist, DH
中科院分区：
文献类型：
--
作者：
Holmes, HJ;Gist, DH
本文对龟鳖的附睾和输精管系统进行了观察。生精小管由一系列导管引流，这些导管在白蛋白图尼卡外形成网。网位于睾丸外侧，由直径不等的紧密连接的小管组成，内衬由鳞状至立方细胞组成的单层上皮。血管网高度发达。一系列的小管（输出小管）连接网和附睾。输出小管高度卷曲，在附睾小管之间延伸，直径不同。单层柱状上皮排列在这些小管内，具有紧密连接，每三个或四个细胞具有长纤毛，伸入管腔。这些上皮细胞的细胞质含有丰富的线粒体。在输出小管的中央部分，上皮细胞具有颗粒，这些颗粒似乎通过顶浆分泌过程分泌到管腔中。附睾本身是一个单一的、长的、高度卷曲的小管，沿着其全长接受输出小管。它由含有几种细胞类型的假复层上皮衬里。最丰富的细胞（泡状细胞）缺乏纤毛，但由于腔膜下方有许多小泡，因此顶端边缘染色较深。小的囊泡似乎在基部彼此融合以形成更大的囊泡。这些细胞似乎具有吸收功能，偶尔精子嵌入其细胞质中。数量第二多的细胞是沿着基底膜的基底细胞。这些细胞的数量在一年中波动，在夏末和初秋最为丰富。一个小而窄的细胞，有一个椭圆形的核和深染的细胞质，从基底膜延伸到顶面，存在于少数，特别是在附睾的尾部区域。该细胞常与另一个核圆、胞质中线粒体丰富的窄细胞联合。(C)2004 Wiley-Liss，Inc.
The epididymis and efferent duct system of the turtle Chrysemys picta were examined. Seminiferous tubules are drained by a series of ducts that form a rete exterior to the tunica albuginea. The rete is located lateral to the testis and consists of anastamosing tubules of varying diameters, lined by a simple epithelium consisting of squamous to cuboidal cells. The rete is highly vascularized. A series of tubules (efferent ductules) connect the rete to the epididymis proper. The efferent ductules are highly convoluted, running between the epididymal tubules and are of varying diameters. The simple columnar epithelium lining these tubules possesses tight junctions, with every third or fourth cell possessing long cilia that protrude into the lumen. The cytoplasm of these epithelial cells contains abundant mitochondria. In the central portion of the efferent ductule, epithelial cells possess granules that appear to be secreted into the lumen by an apocrine process. The epididymis proper is a single, long, highly convoluted tubule that receives efferent ductules along its entire length. It is lined by a pseudostratified epithelium containing several cell types. The most abundant cell (vesicular cell) lacks cilia, but has a darkly staining apical border due to numerous small vesicles immediately beneath the luminal membrane. The small vesicles appear to fuse with each other basally to form larger vesicles. These cells appear to have an absorptive function, and occasionally sperm are embedded in their cytoplasm. The second-most abundant cell is a basal cell found along the basement membrane. The number of these cells fluctuates throughout the year, being most abundant in late summer and early fall. A small narrow cell with an oval nucleus and darkly staining cytoplasm, extending from the basement membrane to the apical surface, is present in small numbers, particularly in the caudal regions of the epididymis. This cell is frequently found in association with another narrow cell having a rounded nucleus and abundant mitochondria in its cytoplasm. (C) 2004 Wiley-Liss, Inc.