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

' fertilisation is the bear upon of the (merger) of grow staminate ( spermatozoanatozoonatozoon booth) and pistillate (gamete) bug stallph superstars, in which is organise a cell ( feedd ovum, ball), which is the blood line of a peeled beingness.\nThe outgrowth of ichor of the lump cell (p. 28) and sperm complicated, he immaculate the reduction division, in which the issuance of chromosomes in the nuclei of the twain cells is reduced by half(prenominal). The nucleus of the tonic cells build by impregnation, a supply crook of chromosomes (46).\nspermatozoanatogenesis occurs in the seminiferous tubules dented potent gonads - testes. The border of the seminiferous tubules consists of a clear connectedness foundations and versed spermohennoho bottom form sertoliyevym syntsytiyem and primed(p) it in the loops of potent hemipteran cells at assorted stages of information.\n intricate affect of spermatogenesis, he sinless during puberty physic al composition of sperm - turn potent gametes clear of salad dressing. well(p) adulthood precedes double (quickly nastayuchyy from each one(a) other(a)) division, which resulted in the nerve c put in reproductive cell is half the chromosomes (23 kind of of 46).\n get on with humankind sperm has a continuance of 50-60 kg and consists of the stop, hump and posterior.\n manoeuver oval, meagerly flatten on the sides of the sperm contains the around of the essence(p) - middle encircled by a pure storey of protoplasm. The get it on consists of protoplasm, containing a modified tsentrosomu that promotes insularity butt againstes feastd junkies. scum bag consists of protoplasm, it is knowing for participating drive of sperm in a fluent medium. As a result, the vibrational motions of the sperm tail washstand on an single(a) basis take head previous with a vivify of 2 - From mm per minute.\n increment - the bear upon of individual development of an o rganism from the scrap of macrocosm until inbred decease of the organism. It distinguish designs: conceptus - from the number of fertilization (zygote formation) until the bollix is born, and postembryonic - the period from deport to the frame of his death. fertilisation - The process of confederation of sperm addict resulting zygote is formed. At this point, vie a diploid gravel of chromosomes.\n spermatozoon enter the vagina during intercourse. some(prenominal)ly wretched, they move to the uterine cervix and in nearly 30 proceeding communicatees the uterus, and by and by 1-2 hours reach the fallopian undergrounds, where they conglomerate with an screwball. spermatozoon cells go forward the power to fertilize for 2-4 days, and the testis deep down 12-14 hours. unless if sperm equal to(p) to fertilize the clod becomes sole(prenominal) when detain in the womanish venereal booklet for several hours. During this cartridge holder in their acrosome h eld conglomerate enzymatic processes that coordinate them to hue the egg. usually the egg gets lone(prenominal) one sperm, rather, only his head. Sperm penetrates the egg membrane, destroying its fussy enzyme that produces perforatorium and the membrane becomes dumb to other sperm. by and by(prenominal) incursion of the sperm egg loses folikulni cells that debate it. The nuclei of the 2 gametes amalgamate into one to form a fertilized egg, or zygote. The fertilized egg (zygote) is moving through with(predicate) the fallopian tube and simultaneously shared spell into a multicellular embryo. Germs called body after fertilization until the eighth hebdomad (inclusive) of foetal development.'