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  2. Human reproduction - Wikipedia

    en.wikipedia.org/wiki/Human_reproduction

    Human reproduction naturally takes place as internal fertilization by sexual intercourse. During this process, the man inserts his erect penis into the woman's vagina and then either partner initiates rhythmic pelvic thrusts until the man achieves orgasm , which leads to ejaculation of semen containing sperm into the vaginal canal.

  3. Human embryonic development - Wikipedia

    en.wikipedia.org/wiki/Human_embryonic_development

    When eight blastomeres have formed, they start to compact. [6] They begin to develop gap junctions, enabling them to develop in an integrated way and co-ordinate their response to physiological signals and environmental cues. [7] When the cells number around sixteen, the solid sphere of cells within the zona pellucida is referred to as a morula ...

  4. Development of the reproductive system - Wikipedia

    en.wikipedia.org/wiki/Development_of_the...

    In the female, the paramesonephric ducts persist and undergo further development. The portions which lie in the genital cord [citation needed] fuse to form the uterus and vagina. This fusion of the paramesonephric ducts begins in the third month, and the septum formed by their fused medial walls disappears from below upward.

  5. Development of the human body - Wikipedia

    en.wikipedia.org/wiki/Development_of_the_human_body

    The process begins with fertilization, where an egg released from the ovary of a female is penetrated by a sperm cell from a male. The resulting zygote develops through mitosis and cell differentiation , and the resulting embryo then implants in the uterus , where the embryo continues development through a fetal stage until birth .

  6. Human fertilization - Wikipedia

    en.wikipedia.org/wiki/Human_fertilization

    Human fertilization is the union of an egg and sperm, occurring primarily in the ampulla of the fallopian tube. [1] The result of this union leads to the production of a fertilized egg called a zygote, initiating embryonic development. Scientists discovered the dynamics of human fertilization in the 19th century. [2]

  7. Embryo - Wikipedia

    en.wikipedia.org/wiki/Embryo

    In organisms that reproduce sexually, embryonic development is the part of the life cycle that begins just after fertilization of the female egg cell by the male sperm cell. The resulting fusion of these two cells produces a single-celled zygote that undergoes many cell divisions that produce cells known as blastomeres .

  8. Birth - Wikipedia

    en.wikipedia.org/wiki/Birth

    Its reproduction is typically parthenogenetic and viviparous and females produce unfertilized eggs which they retain within their bodies. [30] The embryos develop within their mothers' ovarioles and the offspring are clones of their mothers. Female nymphs are born which grow rapidly and soon produce more female offspring themselves. [31]

  9. Prenatal development - Wikipedia

    en.wikipedia.org/wiki/Prenatal_development

    Synapses do not begin to form until week 17. [11] Neural connections between the sensory cortex and thalamus develop as early as 24 weeks' gestational age, but the first evidence of their function does not occur until around 30 weeks, when minimal consciousness, dreaming, and the ability to feel pain emerges. [12]