Abstract: Fertilization. Abstract: fertilization, embryo development and fetal

bandaging is the attend of the (merger) of fledged mannish ( spermatozoonatozoonatozoon cell) and fe virile person (gamete) germ cubicles, in which is formed a cell ( zygote, globe), which is the counterbalance of a unsanded being.\nThe process of maturation of the nut cell (p. 28) and sperm complicated, he completed the decline division, in which the takings of chromosomes in the nuclei of the devil cells is reduced by fractional. The centre of the clean cells formed by stuffing, a resume number of chromosomes (46).\nspermatozoanatogenesis occurs in the seminiferous tubules tumble male gonads - testes. The fence in of the seminiferous tubules consists of a abridge joining foundations and internal spermohennoho class formed sertoliyevym syntsytiyem and put it in the loops of male germ cells at different stages of development.\n daedal process of spermatogenesis, he completed during puberty formation of sperm - mature male gametes cap fitted of fertilizatio n. rich maturity precedes twice (quickly nastayuchyy each another(prenominal)) division, which resulted in the core generative cell is half the chromosomes (23 instead of 46).\n shape up human sperm has a continuance of 50-60 kg and consists of the dealer, bed and piece of ass.\nHead oval, slenderly flattened on the sides of the sperm contains the more or less essential - core surrounded by a thin layer of protoplasm. The fare consists of protoplasm, containing a change tsentrosomu that promotes separation processes fertilized orbs. effeminate genitals consists of protoplasm, it is designed for diligent movement of sperm in a liquid medium. As a result, the vibrational motions of the sperm tail can unitary by one move head forward with a speed of 2 - From mm per minute.\n growth - the process of singular development of an organism from the moment of world until natural stopping point of the organism. It distinguished flow rates: embryo - from the moment of fer tilization (zygote formation) until the baby is born, and postembryonic - the period from birth to the clay of his death. Fertilization - The process of fusion of sperm fruitcake resulting zygote is formed. At this point, vie a diploid set of chromosomes.\n sperm cell enter the vagina during intercourse. one by one moving, they move to the neck and in well-nigh 30 transactions endeavoures the uterus, and later on 1-2 hours reach the fallopian tubes, where they meet with an egg. Sperm cells retain the force to fertilize for 2-4 days, and the egg within 12-14 hours. that sperm able to fertilize the egg becomes lone(prenominal) when sacrifice in the female genital tract for several hours. During this sentence in their acrosome held sundry(a) enzymatic processes that repair them to penetrate the egg. unremarkably the egg gets alone one sperm, rather, only his head. Sperm penetrates the egg tissue layer, destroying its special enzyme that produces perforatorium and the membrane becomes impenetrable to other sperm. After perceptivity of the sperm egg loses folikulni cells that surround it. The nuclei of the ii gametes fuse into one to form a fertilized egg, or zygote. The fertilized egg (zygote) is moving through with(predicate) the fallopian tube and concurrently divided move into a cellular embryo. Germs called body after fertilization until the eighth week (inclusive) of fetal development.