Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
Related to acrosome: cortical granule


A caplike structure at the anterior end of a spermatozoon that produces enzymes aiding in egg penetration.

ac′ro·so′mal (-sō′məl) adj.


(Physiology) a cap-like structure on the tip of a spermatozoon that releases enzymes on encountering the ovum allowing fusion with the ovum in the sexual reproductive process; this part of the process is known as the acrosome reaction
[C19: from acro- + -some3]


(ˈæk rəˌsoʊm)

an organelle covering the head of animal sperm and containing enzymes that digest the egg cell coating, thus permitting the sperm to enter the egg.
[1895–1900; < German Akrosoma; see acro-, -some3]
ac`ro•so′mal, adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.acrosome - a process at the anterior end of a sperm cell that produces enzymes to facilitate penetration of the eggacrosome - a process at the anterior end of a sperm cell that produces enzymes to facilitate penetration of the egg
sperm, sperm cell, spermatozoan, spermatozoon - the male reproductive cell; the male gamete; "a sperm is mostly a nucleus surrounded by little other cellular material"
appendage, outgrowth, process - a natural prolongation or projection from a part of an organism either animal or plant; "a bony process"
References in periodicals archive ?
Low intracellular concentrations of reactive oxygen species (ROS) constitute a physiological factor that affects the activities of the human sperm such as motility, acrosome reaction (AR), capacitation, and fertilization.
Sperm characteristics such as sperm motility, viability, morphology, membrane integrity, and acrosome integrity were decreased in treated groups.
Indeed, protein tyrosine phosphorylation is required for sperm capacitation and acrosome reaction in successful fertilization process (Kopf & Gerton, 1991; Yanagimachi, 1994; Visconti & Kopf, 1998; Stival et al.
Acid phosphatase is present in the acrosome of spermatozoa and in the lysosome of Sertoli cells, spermatocytes and spermatids.
Staining procedure to defect viability and the true acrosome reaction in spermatozoa of various species.
The n-3 and n-6 PUFA are essential for the reproductive activity representing about 30% to 50% of total fatty acid amount in the membrane of mammal spermatozoa [4] and contribute to regulate fluidity and acrosome responsiveness.
Sperm morphology determines the internal organelles such as vacuole, acrosome and base of head which have an important role in fertility.
1 Despite the sophistication, basic requirements for these techniques remained the same, including cost-effectiveness, simplicity of procedure, elimination of reactive oxygen species(ROS), recovery of as much motile but functionally competent spermatozoa, minimal damage to acrosome, and improved pregnancy outcome.
This is because of that the physiological side requires the presence of active oxygen species in small and reasonable quantities because it is necessary for fertilization and acrosome reaction [44].
Results of the study, clearly indicate that osmotic stress primarily damaged the spermatozoa internal structures more severely (mitochondria, acrosome and DNA) rather than plasma membrane.