Implantation

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implantation

[‚im‚plan′tā·shən]
(medicine)
Placement of a tissue transplant in depth in the body.
Placement in the body of a device for mechanical repair, such as for a ventral hernia or a fracture.
Embedding of an embryo into the endometrium.

Implantation

 

the attachment of the embryo to the wall of the uterus in man and in all mammals with intrauterine development.

Three types of implantation are distinguished: superficial implantation, in which the embryo remains in the uterine cavity and attaches itself to the wall either by the entire surface of the trophoblast or by part of it (in Chiroptera and ruminants); eccentric implantation, in which the embryo deeply penetrates a fold of the uterine mucosa (a uterine crypt), the wall of which then grows together over the embryo and forms an implantation chamber that is isolated from the uterine cavity (in rodents); and interstitial implantation, characteristic of higher mammals (primates and man), in which the embryo destroys cells of the uterine mucosa and implants itself within the cavity formed, the uterine defect then healing and the embryo embedding itself totally within the uterine wall, where its subsequent development occurs.

References in periodicals archive ?
In some cases, RIF can be defined as a unique condition due to unidentified abnormalities or damage of the endometrium which would not even allow the initial steps of embryo implantation (apposition, attachment).
The authors found that uterine expression of a gene called Wnt5a - a major signaling molecule in cell growth and movement in both embryo development and disease - is also critical to healthy embryo implantation in the uterus.
Attendees will learn biological aspects of human embryo implantation, enhance their understanding of advanced techniques, and be able to apply evidence-based recommendations to achieve the best outcomes from ART.
We are looking for an increase in so-called natural killer cells which can be implicated in failure of embryo implantation and miscarriage.
A 60% embryo implantation rate is about the highest reported right now with IVF, but we believe there is more key data we can learn about each embryo before uterine transfer that will improve this rate," noted Dr.
KEY WORDS: bisphenol A, embryo implantation, fertility, human, reproduction, women.
Quebec's decision to publicly fund in vitro fertilization and to introduce regulations mandating single embryo implantation, promises to have beneficial health consequences for Quebeckers, as it will reduce multiple pregnancies and the health risks associated with twins, triplets or higher-order multiple gestations.
The researchers discovered that embryo implantation sets off a process that ultimately turns off a key pathway required for the immune system to attack foreign bodies.
From an October 2010 conference in London, 18 articles consider such topics as stem cells in endometrium and their role in the pathogenesis of endometriosis, ovarian cryopreservation strategies and the find control of ovarian follicle development in vitro, strategies to improve embryo implantation to supraphysiological rates, intensive care treatment of ovarian hyperstimulation syndrome, and long-term progestin-only contraception in humans versus animal models.
The technique - if translated in future trials - could be used to select embryos more likely to result in a successful pregnancy, reducing the need for multiple embryo implantation during IVF treatment.
Khalifa Al Nuaimi, Director of Camel and Horse Auctions, said that the camel breeding section of the research centre is concerned with pedigree racing camels and milk-producing camels, and had also overseen many successful projects including breeding over 2,200 pedigree camels via embryo implantation.