Implantation (embryology) - Wikipedia
Implantation, also known as nidation, [1] is the stage in the mammalian embryonic development in which the blastocyst hatches, attaches, adheres, and invades into the endometrium of the female's uterus. [2] Implantation is the first stage of gestation, and, when successful, the female is considered to be pregnant. [3]
Fetal development: The 1st trimester - Mayo Clinic
2022年6月3日 · Once it reaches the uterus, the morula becomes a blastocyst. The blastocyst then burrows into the uterine lining — a process called implantation. The sperm and egg unite in one of your fallopian tubes to form a one-celled entity called a zygote.
Fetal Development: Week-by-Week Stages of Pregnancy - Cleveland Clinic
The fetal stage of development begins around the ninth week and lasts until birth. This is when the embryo officially turns into a fetus. The fetus gets its assigned sex around nine weeks of pregnancy, although your healthcare provider can’t detect it on ultrasound yet. The fetus’s major organs and body systems continue to grow and mature.
Implantation - Embryology
Implantation is a complex initial step in the establishment of a successful pregnancy. Although embryo quality is an important determinant of implantation, temporally coordinated differentiation of endometrial cells to attain uterine receptivity and a synchronized dialog between maternal and embryonic tissues are crucial.
How Your Fetus Grows During Pregnancy - ACOG
There it implants and starts to grow. For 8 weeks after fertilization, it is called an embryo. From 9 weeks after fertilization until birth, it is called a fetus. What is the placenta? The placenta is formed from some of these rapidly dividing cells. The placenta functions as a …
Fetal development by week: Your baby in the womb - BabyCenter
2023年2月21日 · Nestled comfortably in the womb, your baby is constantly growing and changing. Use this timeline to learn what your baby's up to and how they're developing throughout pregnancy. Follow your baby's development week by week, from conception to labor, in these amazingly detailed, doctor-reviewed images.
A Review of Mechanisms of Implantation - PMC - PubMed …
Defective implantation leads to adverse pregnancy outcomes including infertility, spontaneous miscarriage, intrauterine fetal growth restriction and preeclampsia. With use of advanced scientific technologies, gene expression analysis and genetically-engineered animal models have revealed critical cellular networks and molecular pathways.
Stages of Fetal Development - Stages of Fetal Development
About 6 days after fertilization, the blastocyst attaches to the wall of the uterine cavity, usually near the top. This process, called implantation, is completed by day 9 or 10. Blastocyst Attaching to the Wa... The wall of the blastocyst is 1 cell thick except in 1 area, where it is 3 to 4 cells thick.
The Growing Fetus | PDF | Placenta | Implantation (Human …
This document discusses the stages of fetal development from fertilization through the third trimester. It covers key terms like zygote, embryo, and fetus. The stages of development include implantation of the blastocyst, formation of the placenta and fetal membranes, and growth of organs and structures.
Implantation - Motherly
2024年4月2日 · Implantation is a critical stage in pregnancy during which the fertilized egg, or embryo, attaches itself to the wall of the uterus. This process typically occurs about a week after the egg is fertilized. It allows the embryo to receive nutrients and oxygen from the mother for growth and development.