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acrosome

Pronunciation: ak′rō-sōm

Definition: A caplike organelle or saccule derived from Golgi elements that surround the anterior two thirds of the nucleus of a sperm. Enzymes contained within this structure probably facilitate the sperm's penetration of the zona pellucida of the oocyte.

Synonym(s): acrosomal cap, head cap

[acro- + G. soma, body]

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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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