Simões K, Orsi A M, Artoni S M B
Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Goiás, UFG, Goiânia, CEP, Brasil.
Anat Histol Embryol. 2012 Jun;41(3):202-8. doi: 10.1111/j.1439-0264.2011.01124.x. Epub 2012 Jan 3.
The ultrastructure of the spermatozoa of the domestic duck (Anas platyrhynchos sp.) was analysed by transmission and scanning electron microscopies and compared with the results obtained in preliminary studies involving other non-passerine birds. The spermatozoa were characterised by the presence of a short head, short midpiece and long principal piece. The head consisted of a reduced acrosome that contained moderately electron-dense homogenous material. The implantation fossa was observed between the base of the nucleus and the proximal centriole. The midpiece contained electron-dense material associated with the proximal centriole and nuclear membrane, and a long distal centriole surrounded throughout its length by 11-12 elliptical mitochondria. A dense annulus separating the midpiece from the principal piece was visible. Posterior to the annulus, the axoneme was formed surrounded by a dense fibrous sheath, representing the principal piece or flagellum, which was a long segment with a smooth surface and a smaller diameter than the midpiece. The spermatozoon of the domestic duck resembles that of other non-passerine birds, corresponding to a basic type of spermatozoon similar to that of reptiles, called sauropsid type.
通过透射电子显微镜和扫描电子显微镜对家鸭（绿头鸭种）精子的超微结构进行了分析，并与其他非雀形目鸟类初步研究的结果进行了比较。精子的特征是头部短、中段短、主段长。头部由一个缩小的顶体组成，顶体内含有中等电子密度的均匀物质。在细胞核基部和近端中心粒之间观察到植入窝。中段含有与近端中心粒和核膜相关的电子致密物质，一个长的远端中心粒在其整个长度上被11 - 12个椭圆形线粒体包围。可见一个致密的环将中段与主段分开。在环的后方，轴丝被一个致密的纤维鞘包围形成，代表主段或鞭毛，这是一个长段，表面光滑，直径比中段小。家鸭的精子与其他非雀形目鸟类的精子相似，对应于一种类似于爬行动物的基本精子类型，称为蜥形类精子类型。
