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Prenatal Development
The process of growth and development within the womb, where a single-cell zygote (the result of fertilization) becomes an embryo, then a fetus, and undergoes various developmental stages before birth.
Zygote
The initial cell formed when a sperm cell fertilizes an egg cell, representing the earliest stage of embryonic development.
Primitive Brain
Refers to the brain structures involved in basic survival functions, often equated with the brainstem and limbic system.
Conception
The process of a sperm fertilizing an ovum, leading to the formation of a zygote and the beginning of pregnancy.
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