Normal sperm morphology requires that the head tail and midsections of the sperm be normal.

The heads of normal mature sperm are slightly oval in shape and measure approximately 4.0 to 5.5µm in length and 2.5-3.5µm at the widest part. The acrosomal region should be 40-70% of the head area.

Normal midsections are tapered. They do not bulge out or contain extra cytoplasm.

Sperm have a long tail which is slightly thicker near the head than at the end. Sperm tails measure about 50µm.

Normal sperm are seen on the right (a) front view, and (b) lateral view.