ABSTRACT
Synaptonemal complex was first discovered by Moses in 1956. Synaptonemal complex of karyocytes of meiosis of pachytene are observed by electron microscope. They are bivalent chromosomal central substructure. We have observed synaptonemal complex of guinea-pig, rabbit, rat, and mice (Jin Bai Ⅰ, Ⅱ etc.). The basic structure of synaptonemal complex are similar. They contain two lateral elements and one central element which situated in the central space.The end of the synaptonemal complex is attached to the nuclear membrane,. where the inner nuclear membrane forms a thick platelike structure. Lateral elements of spermatocytes of the mouse are divided into two or three sections. The sex vesicle and associated nucleolus appear clearly in the mouse.The axial filaments of X and Y chromosome are attached with an angle of 30 degrees between each other. A typical central element and transverse filaments are formed in the space between. Several nodules are situated on the central element. The number of nodules is from 1-4 in the several experimental rodential animals studied.
