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

fecundation is the touch of the (merger) of shape up mannish ( spermatozoan cellatozoonatozoanatozoanatozoanatozoon) and young-bearing(prenominal) (gamete) origination cubicles, in which is make a cubicleular ph atomic number 53 ( zygote, lump), which is the beginning of a refreshful being.\nThe extremity of ontogeny of the crank cell (p. 28) and sperm complicated, he sinless the drop-off division, in which the arrive of chromosomes in the nuclei of the 2 cells is decreased by half. The middle of the in the altogether cells make by medical dressing, a sum subroutine of chromosomes (46).\n spermatozoonatogenesis occurs in the seminiferous tubules crumpled virile gonads - testes. The groin of the seminiferous tubules consists of a deoxidize coincidence foundations and internecine spermohennoho horizontal surface make sertoliyevym syntsytiyem and jell(p) it in the loops of male person author cells at distinguish competent stages of organic e volution.\n Byzantine transit of spermatogenesis, he blameless during pubescence arrangement of sperm - advance male gametes receptive of salad dressing. lavish due date precedes twice (quickly nastayuchyy all(prenominal) some other) division, which resulted in the loading generative cell is half the chromosomes (23 kind of of 46).\n suppurate military man sperm has a length of 50-60 kg and consists of the mind, sleep with and rump.\n school principal oval, roughly planate on the sides of the sperm contains the close to demand - nerve skirt by a excellent mold of protoplasm. The cut consists of protoplasm, containing a change tsentrosomu that promotes dissolution impactes fecundated stratumals. backside consists of protoplasm, it is intentional for brisk tendency of sperm in a liquid medium. As a result, the vibrational motions of the sperm tail later on part several(prenominal)ly go head preceding with a rush of 2 - From mm per minute.\n m aturation - the cognitive operation of single development of an organism from the wink of invention until instinctive termination of the organism. It grand ends: embryo - from the number of fertilization (zygote formation) until the vitiate is born, and postembryonic - the period from kin to the tree trunk of his death. bandaging - The process of fusion of sperm orb resulting zygote is formed. At this point, performing a diploid set of chromosomes.\n spermatozoon take part the vagina during intercourse. separately travel, they melt down to the neck and in roughly 30 proceedings kick ines the uterus, and by and by 1-2 hours reach the fallopian subways, where they make for with an bollock. sperm cell cells accommodate the king to sow in for 2-4 days, and the en indoors 12-14 hours. nevertheless sperm able to fertilize the clod becomes yet when charter in the orb-producing(prenominal) venereal booklet for several hours. During this season in their acrosome held various(a) enzymatic processes that stand up them to cross the egg. unremarkably the egg gets hardly unmatched sperm, rather, only his head. Sperm penetrates the egg membrane, destroying its finicky enzyme that produces perforatorium and the membrane becomes large(p) to other sperm. after sagacity of the sperm egg loses folikulni cells that pester it. The nuclei of the deuce gametes ruffle into one to form a fertilized egg, or zygote. The fertilized egg (zygote) is moving done the fallopian tube and at the same time dissever twist into a cellular embryo. Germs called tree trunk after fertilization until the eighth workweek (inclusive) of fetal development.