The structure of the end piece of sperm is almost the same as that of the rest of the tail. It is composed of axoneme which is covered all around by the plasma membrane. The end piece has a ring of 9 doublets of microtubules.

FUNCTION

The function of the tail is to propel the sperm. The fibers of the tail contract in an alternative pattern producing a wavelike movement. This motion of the sperm is very important for its passage through the seminal fluid and fertilization of the ovum.

CLINICAL IMPORTANCE

The structural integrity and function of the end piece of sperm is important for fertilization of egg. The abnormality in the internal core, axoneme, impairs the motility of sperm rendering the male infertile.