blastocyst is implanted outside the uterus in the female human reproductive system when ectopic pregnancy occurs.
where does the blastocyst implanted in the female human reproductive system when ectopic pregnancy occurs?
outside the uterus
in rare cases of ectopic pregnancy, there may be two fertilized eggs, one outside the uterus and the other inside. this is called a heterotopic pregnancy. often the intrauterine pregnancy is discovered later than the ectopic, mainly because of the painful emergency nature of ectopic pregnancies. since ectopic pregnancies are normally discovered and removed very early in the pregnancy, an ultrasound may not find the additional pregnancy inside the uterus. when hcg levels continue to rise after the removal of the ectopic pregnancy, there is the chance that a pregnancy inside the uterus is still viable. this is normally discovered through an ultrasound.
ectopic pregnancy
tubal pregnancy is when the egg is implanted in the fallopian tubes. hair-like cilia located on the internal surface of the fallopian tubes carry the fertilized egg to the uterus. fallopian cilia are sometimes seen in reduced numbers subsequent to an ectopic pregnancy, leading to a hypothesis that cilia damage in the fallopian tubes is likely to lead to an ectopic pregnancy. women who smoke have a higher chance of an ectopic pregnancy in the fallopian tubes. smoking leads to risk factors of damaging and killing cilia. as cilia degenerate, the amount of time it takes for the fertilized egg to reach the uterus will increase. the fertilized egg, if it doesn't reach the uterus in time, will hatch from the non-adhesive zona pellucida and implant itself inside the fallopian tube, thus causing the ectopic pregnancy.
ectopic pregnancy