An Introduction to Embryonic and Fetal Development

The video explains the embryonic development stages of vertebrates, starting with fertilization, where an egg and sperm form a zygote. The zygote undergoes cell division to form a Blastula, and in mammals, this stage is called a Blastocyst, which includes an Inner Cell Mass. This mass differentiates into various organs, while outer cells form protective tissues. The embryo develops primitive organ systems, and once fully formed, it is termed a fetus. The fetal stage involves significant growth and organ development, concluding at birth.

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