Dear student

Hope your query is about human sperm

A human sperm cell consists of a flat, disc shaped head 5.1 µm by 3.1 µm and a tail 50 µm long.

Head: It has a compact nucleus with only chromatic substance and is surrounded by only a thin rim of cytoplasm.

Neck: It is the smallest part (0.03 ×10 ⁻⁶ m), and has a proximal centriole parallel to the base of the nucleus and distal centriole perpendicular to the previous one.

Middle piece: It has 10–14 spirals of mitochondria surrounding the axial filament in the cytoplasm

Tail: It is the longest part (50×10−6 m), having an axial filament surrounded by cytoplasm and plasma membrane, but at the posterior end the axial filament is naked.

If you are doing entrance exam preparation then you should refer to ncert book data for the correct answer because examiner will set options according to it.

Hope this information helps you

All the best !!