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Questions and Answers
What is the innermost membrane surrounding the ovum called?
What is the innermost membrane surrounding the ovum called?
Which type of membrane is characterized by being secreted by follicular cells?
Which type of membrane is characterized by being secreted by follicular cells?
In which type of animals is the tertiary membrane notably present?
In which type of animals is the tertiary membrane notably present?
What substance is primarily formed in the cytoplasm of ova during their growth period?
What substance is primarily formed in the cytoplasm of ova during their growth period?
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Which layer is the outermost membrane structure of the ovum?
Which layer is the outermost membrane structure of the ovum?
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Study Notes
Protective Membranes of the Ova
- Ova are protected by primary, secondary, and tertiary membranes
- Primary membrane: innermost layer, produced by the egg cytoplasm and found in all animals. It's also known as the vitelline membrane.
- Secondary membrane: known as the zona pellucida, found in mammals only, and secreted by the follicular cells.
- Tertiary Membranes: additional layers secreted by the oviduct when the egg passes through it, examples include the jelly-like material in frog's eggs or the albumen layer and shell in birds and reptiles.
Classification of Ova
- Ova are classified by the amount of yolk they contain.
Diagram of Ovum
- An ovum is comprised of various components: corona radiata, zona pellucida, vitelline membrane, nucleus (germinal vesicle), ooplasm (the main part of the ovum), and yolk.
- Frog eggs are a good example of ova with lots of yolk surrounded by a jelly-like tertiary membrane.
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Description
Explore the structure and classification of ova, focusing on the primary, secondary, and tertiary membranes that offer protection. This quiz will test your understanding of the various components of an ovum and how they differ across species, particularly in mammals and amphibians.
