透とう明めい帯たい

noun

zona pellucida

A specialized term in embryology and reproductive biology referring to the glycoprotein layer surrounding the plasma membrane of an oocyte.

• 受じゅ精せいの際さい、精せい子しは透とう明めい帯たいを通つう過かする必ひつ要ようがある。

  During fertilization, the sperm must pass through the zona pellucida.