You searched for: “acrosomes
acrosome (s) (noun), acrosomes (pl)
A structure at the end of a sperm cell that releases enzymes aiding in the penetration of the cell membrane of an egg: The acrosome enables the sperm to enter the egg for fertilization.

The acrosome is the body at the apex of a spermatozoon.

The acrosome can also be described as the cytoplasmic cap-like structure on the front of a spermatozoan (sperm; a mature male germ cell).