Okamura F, Nishiyama H
Cell Tissue Res. 1978 Apr 28;188(3):497-508. doi: 10.1007/BF00219787.
The developing outer layer of the vitelline membrane of the ovum in the posterior part of the infundibulum of the domestic fowl contains many spermatozoa in nearly parallel orientation with its inner layer. When the acrosomal region of a spermatozoon approaches or contacts the inner layer, promptly undergoes the acrosome reaction. The outer acrosomal membrane and overlying plasma membrane fuse together and the apical region of the acrosome opens, so that the acrosomal contents are released. Meanwhile the spermatozoon remains a time in contact with the surface of the inner layer, and the network of the inner layer just under the tip of the sperm head begins to be dissolved. This dissolution extends downward forming a tunnel, approximately 9 micrometer in diameter. The spermatozoon then passes through the inner layer obliquely via the central region of the tunnel and arrives at the perivitelline space.
在家禽漏斗部后部，卵子卵黄膜的发育外层含有许多精子，这些精子几乎与内层平行排列。当精子的顶体区域接近或接触内层时，会迅速发生顶体反应。顶体外膜和覆盖其上的质膜融合在一起，顶体的顶端区域打开，从而释放顶体内容物。与此同时，精子与内层表面保持一段时间的接触，精子头部顶端下方的内层网络开始溶解。这种溶解向下延伸形成一个直径约9微米的通道。然后精子通过通道的中心区域倾斜穿过内层，到达卵周隙。
