<P> The mammalian sperm cell consists of a head , neck , a midpiece and a tail . The head contains the nucleus with densely coiled chromatin fibres , surrounded anteriorly by an acrosome , which contains enzymes used for penetrating the female egg . The neck contains the sperm centriole . The midpiece has a central filamentous core with many mitochondria spiralled around it , used for ATP production for the journey through the female cervix , uterus and uterine tubes . The tail or `` flagellum '' executes the lashing movements that propel the spermatocyte . </P>
where are the mitochondria located in the sperm
midpiece