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1、HelenHeBio12FemaleReproductiveSystem(ONTHETEST:remembertostudythedaysofdifferentphasesinthemenstrualcycle)-MeiosisIIwillNOToccurunlesstheeggencountersasperm(polarbodyreabsorbed)Fertilization(maybe..)-Secondaryoocyteandspermcouldmeetinoviduct(oocyteàegg)-Acrosomeonsper
2、mdigestsitswayintotheegg-Corticalreactionpreventsasecondspermfromentering-TwospermsstrikeaneggàNOTatwin!ToomuchDNA-Twins:identicaltwinsandfraternaltwinsoIdenticaltwins:resultfromthesplittingofthesamefertilizedeggoFraternaltwins:fertilizationoftwodifferenteggsHelenHeBi
3、o12FertilizedEggDevelopment(maybe..)-Zygoteàmorulaàblastula-EstablishesfuturedevelopmentImplantation-Fertilizedeggcanimplantintheendometrium(nourishestheegg)-Implantationintheoviduct=BAD(ectopicpregnancy)IffertilizationDOESN’Toccur(LIKELY!)-Corupuslutemeventuallydies-
4、Lackofprogesteronecausesuterinecontracts-Menstruation!oShedsendometrium-Startalloveragain…HypothalamusSo…h(huán)owisthiscyclecontrolled?-FSHGnRH+LH-FSHandLHAnteriorpituitaryLHFSHovulationFollicleDevelopmentCorpusluteumforms(estrogenand)progesteroneEstrogenPrepareendometrium
5、SecondaryfemalecharacteristicsUterinecontractionsHelenHeBio12WhatiftheeggISfertilized?-ImportanttomaintainprogesteronelevelsoStopsuterinecontractionsYolksacforhuman:verytemporaryfoodstorage;wehavetheplacenta-“Waterbreaks:”amnionsacbreaks-Placenta:-Materialsexchangeacr
6、ossmembranes-mother’sbloodvesselsandbaby’sarenotphysicallyconnectedoOnlybydiffusionsHelenHeBio12Humanembryonicdevelopment-Embryoshowingtail&limbbuds-Beginningoftheeyecanbeseen,aswellthebulgingheartandtheumbilicalchord-lensoftheeyecanbeseenforming,themassoftheheartbulg
7、ingfromthechest,&thebeginningsofthefingerrays-Beginningoftheearisclearlyseen-Week9-week40=fetusoAfter12weeksorso,thebaby’sdevelopmentislargely“finished”§Someexceptions:brain&lungdevelopment
