Primordial germ cells.Conversion of germ cells in male and female gametes Development begins with fertilization, a process by which the male gamete esparmatozoide and the female gamete, the oocyte unite to give rise to cigoto.
Gametes derived from primordial germ cell occurring in the epiblasto during the second week of development and that moves to the wall Yolk sac.
During the fourth week of this development cells begin to migrate from the wall of the bag to the developing gonads wing which come towards the end of the fifth week, their number is increased by divisions mitoticas during migration and when they reach the gonads as preparation for fertilization, then is when germ cells esperimentan process called meiosis, which includes gametogenesis to reduce the number of chromosomes and I quote differentiation to complete its maturation.Primordial germ cells and teratomas.• Teratomas are the origin of tumors discussed that often contain a variety of tissues such as bone, hair, muscles, and other intestinal epithelium. It is thought that these tumors originate starting mothers pluripotent cell that can differentiate in any of the three germ lamins or its derivative. Suguiere some evidence that the primordial germ cells that are away from their normal migratory pattern can be the cause of some of these tumors. Another source is starting cell epiblastica migrating through the line during the primitive gastrulating.
hecho por mercy urda y elsa diaz
