acrosomal cap


ac·ro·some

(ak'rō-sōm), 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]

ac·ro·so·mal cap

(ak'rō-sō'măl kap) A collapsed caplike membranous vesicle that covers the anterior part of the nucleus of a spermatid, derived from the acrosomal granule.