Kosmix: Blastocyst Overview

Blastocyst Guide

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Reviewed By Deirdre OReilly, MD

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When sperm is deposited in the vagina, it travels through the cervix and into the Fallopian tubes.

ZYGOTE

A single sperm penetrates the mother's egg cell, and the resulting cell is called a zygote. The zygote contains all of the genetic information (DNA) necessary to become a child. Half of the genetic information comes from the mothers egg and half from the fathers sperm. The zygote spends the next few days traveling down the Fallopian tube and divides to form a ball of cells.

BLASTOCYST

The zygot continues to divide, creating an inner group of cells with an outer shell. This stage ...

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Encyclopedia: Blastocyst

WIKIPEDIA.ORG

The blastocyst is the structure formed in early embryogenesis, after the formation of the blastocoel, but before implantation. It possesses an inner cell mass, or embryoblast which subsequently forms the embryo, and an outer cell mass, or trophoblast which forms the placenta. The human blastocyst arises after compaction and comprises 70-100 cells. It is preceded by a zygote, the fertilized egg cell, and succeeded by an embryo. Blastocyst formation begins...

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