[Synaptonemal complexes of human spermatocytes and foetal oocytes observed by electron microscopy].

The electron microscopical studies on the synaptonemal complexes (SC) of Chinese spermatocytes and foetal oocytes have been made and used to construct SC karyotype with a modified surface micro-spreading technique. We also confirm the SC formation between the short arms of the X chromosome and Y chromosome as well as secondary association between the distal tips of Xq and Yq at pachytene. Moreover, attentions are paid to the morphology of the XY pairs and five pairing type of XY pairs. In our preparations, a rare triploid spermatocyte was observed and triple pairing was described. Some possible significances of the triple pairing of triploid spermatocyte in relation to the human chromosomal abnormalities have been supposed.