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  • Acrosome

    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. Historical Examples The acrosome seems to develop directly out of the cytoplasm. Studies in Spermatogenesis Nettie Maria Stevens Spermatids containing both the chromatin nucleolus (n) and the odd chromosome (x), […]

  • Acrosin
  • Acrosomal cap

    acrosomal cap acrosomal cap n. A caplike structure at the anterior end of a spermatozoon that produces enzymes aiding in egg penetration. Also called acrosome, head cap.

  • Acrosomal granule

    acrosomal granule acrosomal granule n. A large granule that is formed by the coalescing of proacrosomal granules within the acrosomal vesicle and adheres to the nuclear envelope of a developing spermatozoon.

  • Acrosomal vesicle

    acrosomal vesicle acrosomal vesicle n. A vesicle derived from the Golgi apparatus during spermiogenesis; its membrane adheres to the nuclear envelope of the sperm and, together the the acrosomal granule within the vesicle, spreads in a thin layer over the pole of the nucleus to form the acrosomal cap.

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