Human sperm consists of 4 parts. namely-
1. Head: The oval or oval part in front of the sperm is called the head. It is covered by a plasma screen. It has such a large nucleus. Nucleus contains 23 chromosomes. At the front of the head is the cap-like acrosome. Acrosome is composed of Golgibodies and filled with hydrolytic enzymes.
2. Neck: The narrow and constricted part behind the sperm head is called the neck. It has two centrioles. Proximal centriole and distal centriole.
3. Middle piece: The next widest part of the gribar is called the middle piece. It contains ring centrioles.
4. Tail : The next narrow and long part of the middle section is the tail. There are two centrioles at the front of the tail. Axial filaments arise from a centriole and extend to the tip of the tail. Mitochondria are present along the axial nucleus. The tail is covered by a sheath.