Embryo development stages

Описание: ​The 5-Day Journey: Embryo Development in the Lab

​In the world of IVF, the embryology lab acts as a high-tech "nursery." Here is the step-by-step evolution from a single cell to a complex blastocyst.
​Day 0: Fertilization
​The journey begins. After the egg retrieval, embryologists introduce the sperm to the egg via Conventional Insemination (swimming in a dish) or ICSI (direct injection). This is the "zero hour" where the genetic blueprints first meet.
​Day 1: The Zygote (The Check-In)
​Roughly 16–18 hours later, we look for two circles in the center of the egg called Pronuclei (2PN). One contains the mother’s DNA and the other the father’s. If we see two, fertilization is successful!
​Day 2 & 3: The Cleavage Stage
​The single cell begins to divide. On Day 2, we ideally see 2 to 4 cells. By Day 3, the embryo should reach the 8-cell stage. At this point, the embryo is still the same total size it was as an egg; the cells are simply getting smaller with every split.
​Day 4: The Morula (Compaction)
​This is a critical transition. The individual cells begin to "compact," pressing against each other until their borders disappear. It now looks like a solid ball of cells called a Morula (Latin for "mulberry"). This is the stage where the cells first start communicating and deciding their future roles.
​Day 5 & 6: The Blastocyst
​The finish line for the lab stage. The embryo develops a fluid-filled cavity and differentiates into two distinct parts:
​The Inner Cell Mass (ICM): The small cluster of cells that will eventually become the baby.
​The Trophectoderm: The outer ring of cells that will become the placenta.
​Once it reaches this stage, the embryo is ready for a transfer, biopsy for genetic testing (PGT), or cryopreservation (freezing).

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Disclaimer:
This YouTube channel, operated by Androplus Clinic, provides educational and informational content about In Vitro Fertilization (IVF), and related topics on infertility and Urology. The information presented here is intended for general knowledge and informational purposes only, and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatments.