渔游蛇精子的超微结构

扫描电镜观察表明，渔游蛇（Ｎａｔｒｉｘ Ｐｉｓｃａｔｅｒ）精子总长度约１１０μｍ，分为头和尾两部分；头部呈前稍尖的细长圆柱形，略变曲，约长８．５μｍ，直径以经约０．６μｍ。尾部又分４段：颈段、中段、主段和末段；其与从不同之处是中段较长，约７３μｍ，占精子总长度的２／３多；线料体型鞘由近５００圈超过５０００个线粒体构成；透射电镜揭示了头部顶体体覆疬于核前约１／２；尾部颈段的结构较复杂，包括连接片的踝

ULTRASTRUCTURE OF THE SPERMATOZOON OF NATRIX PISCATER

Scanning eletron microscopic abservation demonstrated the total length of the spermatozoon of Natrix piscater is about 110 μm . It consists of two parts head and tail.The head is about 8.5 μm long and 0.6 μm in diameter. It is like a slight column with a subacute front and a little curned. The tail consists of 4 segments neck region, midpiece, principle piece and endpiece. It has a relatively long midpiece,about 73 μm, accounting for 2/3 of the totle lenth of the spermatozoon.The mitochondrial sheath consists of about 500 rings and more than 5 000 mitochondrials. Transmission eletron microscopic abservation revealed the head acrosomal complex covers 1/2 of the front of the nucleus.The structure of the tail neck region is relatively complex and consisted of a capitulum with the connecting piece,proximal centriole,distal centriole and mitochondrial. And these mitochondrials here do not form mitochondrial sheath. The annulus is between the midpiece and the principle piece,but the recess is not distinctive.Giving a 9+2 pattern,the axoneme complex runs through almost whole sperm tail. Plate 1, Ref 6