After the eupyrene and apyrene sperm were released from testis, their ultrastructure changed distinctly in the sperm-modified vesicle. 棉铃虫真核和无核精子束从精巢中排出后，其细微结构在修精囊中发生了显著的变化。
Moreover, the apyrene sperm bundle dissolved to single sperm and some substances surrounded the surface of each apyrene sperm. 无核精子束从精巢中排出后，在修精囊中己分散为单个的精子，其质膜表面也逐渐附着一些细胞外物质。
