Primordial germ cell
Primordial germ cells (English primordial germ cells ), also known as primordial or Gonozyten, the conditions for which are sexual reproduction . In the human embryo, they arise in the third week in the wall of the yolk sac . In the 6th week they migrate into the gonadal system. In all vertebrates, primordial germ cells are separated from the body cells ( somatic cells ) at an early stage in their development . Germ cells develop from an original germ cell .
Important steps
- Migration of the primordial germ cells to the developing gonads
- Mitotic proliferation phase
- Going through meiosis
- Differentiation into mature gametes
literature
- Heinrich Zankl: From the germ cell to the individual. Verlag CH Beck, 2001, ISBN 3-406-44749-X .
- Thomas W. Sadler: Medical Embryology. Verlag Thieme, 2003, ISBN 3-13-446610-4 .
Individual evidence
- ^ Dietrich Starck: Embryology. A textbook on a general biological basis. 3. Edition. Thieme, Stuttgart 1975, pp. 1-45: Germ cells and germ cell formation.