e spermatozoa structure of spermatozoa: ●60 um length ●head:- pear-shaped -flattened nucleus acrosome .tail: flagellum(centriole neck -middle segment mitochondria sheath -principal segment end segmente. spermatozoa: ---structure of spermatozoa: 60 um length head: -pear-shaped -flattened -nucleus -acrosome tail: flagallum (centriole) -neck -middle segment: mitochondria sheath -principal segment -end segment