The Acrosome Reaction and Fertilization in the Bivalve, Laternula limicola, in Reference to Sperm Penetration from the Posterior Region of the Mid-piece

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The processes of acrosome reaction and sperm penetration in the bivalve Laternula limicola were observed using light and electron microscopy. The spermatozoon of Laternula limicola is unique with respect to the position of the acrosome. The acrosome of the mature spermatozoon is situated posterior to the mitochondria in the sperm mid-piece. The acrosome consists of a bipartite structure, the acrosomal vesicle and the subacrosomal region. In the first stage of the acrosome reaction , a pit forms at the posterior tip of the acrosomal vesicle . In the second stage , the outer membrane of the acrosomal vesicle and the sperm plasma membranes fuse at the lateral part of the acrosome and open. In the third stage, the plasma membrane continually degrades and the inner acrosomal membrane is exposed. In the fourth stage, the exposed inner acrosomal membrane contacts the apex of an egg microvillus. At the site of contact, a fertilization cone is rapidly formed . Sperm incorporation in this species first begins at the posterior lateral region of the sperm mid-piece , not at the anterior region of the sperm head in the manner of many other species, because the acrosome lies at the most posterior end of the mid-piece . Sperm incorporation from the mid-piece has not been previously described . The present report on normal fertilization is the first description of the morphological changes in the acrosome of Laternula limicola spermatozoa and sperm incorporation beginning at the posterior region of the sperm mid-piece.
社団法人日本動物学会の論文
1994-02-15

The Acrosome Reaction and Fertilization in the Bivalve, Laternula limicola, in Reference to Sperm Penetration from the Posterior Region of the Mid-piece

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