acrosomal reaction


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acrosomal reaction

[ak′rəsō′məl]
the pattern of various chemical changes that occur in the anterior of the head of the spermatozoon in response to contact with the ovum and that lead to the sperm's penetration and fertilization of the ovum.

Acrosomal Reaction

A necessary and irreversible step in fertilisation, which is triggered by a sperm receptor, in which the sperm’s and ovum’s plasma membranes fuse and the sperm penetrates the ovum’s zona pellucida.

acrosomal reaction

Reproductive medicine A necessary and irreversible step in fertilization which is triggered by sperm receptor, in which the sperm's and ovum's plasma membranes fuse and the sperm penetrates the zona pellucida. Cf Capacitation.

acrosomal reaction

(ak″rŏ-sō′măl)
The release of enzymes from the acrosome on the head of the sperm. This process causes the sperm to penetrate the zona pellucida of the egg and begin fertilization.
References in periodicals archive ?
Cholesterol and zinc usually stabilize sperm cell membrane and must be removed during capacitation to enable acrosomal reaction and penetration of the ova.
Manipulation of cord structures is not associated with the production of ASA (20) and even the effect of ASA on acrosomal reaction has been challenged in some studies (21).
Then spermatozoa adhere to the oocytes zona pellucida to induce the acrosomal reaction, in which the fusion of the spermatozoal plasma membrane and the outer acrosomal membrane occurs to allow the acrosomal enzymes to be released.
The second, third and fourth steps of this process, respectively, are the acrosomal reaction, the sperm cell and egg cell adhesion through the vitelline envelope, and the actual membrane contact between the two cells.