Question

The correct path of sperm penetration in the secondary oocyte is:

• A. Corona radiata→ perivitelline space→ zona pellucida→ plasma membrane
• B. Corona radiata→ zona pellucida→ perivitelline space→ plasma membrane
• C. Zona pellucida→ corona radiata→ perivitelline space→ plasma membrane
• D. Zona pellucida→ perivitelline space→ corona radiata→ plasma membrane

Answer 1

The correct option is B Corona radiata→ zona pellucida→ perivitelline space→ plasma membrane


From outside to inside, the layers of the secondary oocyte are arranged as follows:- corona radiata→ zona pellucida→ perivitelline space→ plasma membrane.
The cytoplasm of the oocyte is surrounded by a plasma membrane.
Perivitelline space is the space between the zona pellucida and the plasma membrane. It is present outer to the plasma membrane.
The layer outer to the perivitelline space is the zona pellucida. It is a thick transparent membrane.
Outer to the zona pellucida layer, are found the cells of corona radiata.