The outer layer is called a trophoblast which will develop into part of the placenta. Thank You for Your Contribution! Temporal effect of human oviductal cell and its derived embryotrophic factors on mouse embryo development. The acrosome of sperm comes in contact with the corona radiata and releases digestive enzymes that break down a gelatinous layer around the egg called, the zona pellucida. If the pregnancy occurs, the elongation and branching of the terminal ductules appear. The ovarian tissue is divisible into two different regions:
Fertilization of the Ovum - Human Anatomy
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In the oviparous animals all birds , most fish , amphibians and reptiles the ova develop protective layers and pass through the oviduct to the outside of the body. I am a student I am a teacher. Upon pollination , a pollen tube delivers sperm into the gametophyte and one sperm nucleus fuses with the egg nucleus. Please try again later.