Prenatal development

Prenatal development

This animation demonstrates the development of the human embryo and fetus.



pregnancy, fertilization, female reproductive organ, fetus, development, implantation, ontogeny, womb, ovary, Fallopian tube, vagina, endometrium, cervix, cervical os, sperm cell, zygote, amniotic sac, placenta, umbilical cord, egg, embryo, morula, blastocyst, germ layer, yolk sac, chorionic villi, neural tube, limb bud, smooth muscle, menstruation, ovulation, human, biology

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  • - Egg cells develop and mature in this organ. Once about every 28 days, a mature egg is released from the ovary, that is, ovulation occurs. When it enters the Fallopian tube, fertilization can take place.
  • - During ovulation, the mature egg is released from the ovary and enters this tube. Fertilization takes place here.
  • - During sexual intercourse, sperm cells enter the vagina, then they proceed to the Fallopian tube, where they may be fertilized.
  • - It is located between the cavity of the uterus and the vagina. The diaphragm is a contraceptive that serves a cervical barrier: it prevents sperm cells to reach the Fallopian tubes where they could fertilize the egg.


  • - The chromosomes of the sperm and egg cells are haploid. During fertilization the two sets of chromosomes of gametes merge and the result is a diploid cell, called the zygote. The diploid cells of the offspring develop from this. Haploid gametes are then produced by the gonads of the offspring by meiosis.
  • - The distance between the egg cell and the cell membrane increases. This prevents the already fertilized egg from being fertilized by another sperm cell.

  • - Fertilized egg. All our body cells are its descendants.
  • - The blastocyst is implanted in the lining of the uterus on the 7th day after fertilization.
  • - It induces the development of the neural folds. It has evolved from the notochord of chordates (e.g. lancelets). It develops into the inner region of the intervertebral disks.
  • - The groove gradually deepens and forms neural folds, which ultimately meet and grow together in the middle line and thus form the neural tube. This takes place on the 21st day after fertilization.
  • - Its blood vessels enter the placenta, where the substances from the mother's blood are mixed into the blood of the fetus.

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The zygote is the initial cell formed when two gamete cells are joined by means of sexual reproduction.

Female reproductive system (basic)

The reproductive system is a series of organs working together for the purpose of reproduction.

Female reproductive system (intermediate)

The reproductive system is a series of organs working together for the purpose of reproduction.

Male reproductive system

The reproductive system consists of organs which work together for the purpose of reproduction.


Our gametes are haploid cells produced from diploid cells by meiosis, a special type of cell division.


Mitosis is the process by which a eukaryotic cell divides into two cells and the number of chromosomes remains unchanged.

The ear and the mechanism of hearing

The ear converts the vibrations of air into electric signals which are then processed by the brain.

The sense organs

Organs that detect signals of the environment or of the body and transmit them to the brain as nerve impulses.


Carrier of genetic information in cells.

The reproduction and development of insects

Based on their life cycle, insects can be grouped into three categories: ametabolous, hemimetabolous or holometabolous insects.

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