Describe the structure of a sperm.

(N/A) sperm is a microscopic structure composed of a head,neck,a middle piece,and a tail.
$A$ plasma membrane envelops the entire body of the sperm.
The sperm head contains an elongated haploid nucleus,the anterior portion of which is covered by a cap-like structure called the acrosome.
The acrosome is filled with enzymes (such as hyaluronidase) that help in the fertilization of the ovum.
The middle piece of the sperm possesses numerous mitochondria,which produce energy for the movement of the tail that facilitates sperm motility,which is essential for fertilization.
The human male ejaculates about $200$ to $300$ million sperms during a single coitus,of which,for normal fertility,at least $60 \%$ sperms must have normal shape and size,and at least $40 \%$ of them must show vigorous motility.