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Embryology Term

Blastocyst

Last updated: June 2026

Definition

A hollow ball of cells formed about 5 days after fertilization, which is the stage of embryonic development that implants into the uterine wall.

Clinical Context

In obstetrics and maternal healthcare, terms like Blastocyst represent key anatomical, physiological, or developmental parameters monitored during gestation, labor, and the postpartum stages. Understanding these terms empowers parents to converse with doctors, interpret ultrasound reports, and track fetal progress.

Medical Notice: This term definition is for educational and planning purposes only. It is not medical advice. If you have any clinical questions or concerns about blastocyst in your own pregnancy, consult your obstetrician or health team immediately.

Term FAQs

What is the definition of Blastocyst?

In pregnancy and obstetrics, Blastocyst is defined as: A hollow ball of cells formed about 5 days after fertilization, which is the stage of embryonic development that implants into the uterine wall.

What category does the term Blastocyst belong to?

The term Blastocyst belongs to the Embryology category of pregnancy and neonatal health terminology.

Why is understanding Blastocyst important?

Understanding Blastocyst helps expectant mothers and partners make sense of medical reports, doctor consultations, and gestational developments.

Related Terms

Embryo

The developing offspring from the second to the eighth week after fertilization, after which it is called a fetus.

Fetus

The clinical term for the developing baby from the ninth week after fertilization until birth.

Implantation

The attachment of the fertilized egg (blastocyst) to the endometrium (inner lining) of the uterus, occurring 6-12 days after conception.
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