|Human ovum. The zona pellucida is seen as a thick clear girdle surrounded by the cells of the corona radiata.|
|Gray's||subject #3 38|
The zona pellucida (or zona striata in older texts) is a glycoprotein membrane surrounding the plasma membrane of an oocyte. It is a vital constitutive part of the latter, external but not extraneous to it.
The zona glycoprotein, ZP3, is responsible for sperm binding, adhering to proteins on the sperm plasma membrane. There is evidence that ZP3 is then involved in the induction of the acrosome reaction, whereby a spermatozoon releases the contents of the acrosomal vesicle.
Function in humans
Glycoproteins in ZP1, 2, and 3 are targets for immunocontraception.
In non-mammalian animals, the zona pellucida (called vitelline layer) plays an important role in preventing breeding of different species, especially in species that fertilize outside of the body (e.g. fish).
The zona pellucida is commonly used to control wildlife population problems by immunocontraception. When the zona pellucida of one animal species is injected into the bloodstream of another, it results in sterility of the second species due to immune response. This effect can be temporary or permanent, depending on the method used. In New Jersey, Porcine zona pellucida is used to keep deer populations low, and this process is commonly referred to as "spay-vac".
- Follicle histology.gif
Early folliculogenesis from primordial to early tertiary.
First stages of segmentation of a mammalian ovum.
- Oehninger S (2003). "Biochemical and functional characterization of the human zona pellucida". Reprod Biomed Online. 7 (6): 641–8. PMID 14748962.
- Bagnell, C. 2005. "Animal Reproduction". Rutgers University Department of Animal Sciences.
- Histology image: 18404loa – Histology Learning System at Boston University - "Female Reproductive System: ovary, cumulus oophorus "
- Histology image: 14805loa – Histology Learning System at Boston University - "Female Reproductive System: ovary, multilaminar primary follicle"
- Histology at University of Southern California rep/c_7
- Histology at University of Southern California rep/c_12
- Organology at UC Davis Reproductive/mammal/ovary2/ovary7 - "Mammal, canine ovary (LM, High)"
- Image at um.edu.mt
- Image at um.edu.mt