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Chapter 4

Chapter 4 Psyc 4070 (Got A+ on the test)

14 Pages
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Department
Psychology
Course Code
PSYC 4070
Professor
All

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PrenatalDevelopmentChapter41FROMZYGOTETONEWBORNaGerminalthefirst14daysiNotethemostdramaticandextensivetransformationoftheentirelifespanhappensbeforebirthiiGerminalperiodthefirst2weeksofprenataldevelopmentafterconceptioncharacterizedbyrapidcelldivisionandthebeginningofcelldifferentiationiiiBlastocystacellmassthatdevelopsfromthezygoteinthefirstfewdaysafterconceptionduringthegerminalperiodandformsahollowsphereinpreparationforimplantation1TheentirecellmassthattakesondistinctcharacteristicsandgravitatestowardparticularpositionsivPlacentatheorganthatsurroundsthedevelopingembryoandfetussustaininglifeviatheumbilicalcorditisattachedtothewalloftheuterus1Aboutafteraweekafterconceptiontheblastocytenowconsistingofmorethan100cellsseparateinto2distinctmassestheouterformbecomestheplacentavImplantationtheprocessabout10daysafterconceptioninwhichthedevelopingorganismburrowsintotheplacentathatlinestheuteruswhereitcanbenourishedandprotectedasitdevelops1Thisisthefirsttaskoftheoutercell260ofallnaturalconceptionsand70ofallinvitroconceptionsfailtoimplant3ThemostDangerousJourneyaInthefirst10daysafterconceptiontheorganismdoesntincreaseinsizebtitisnotyetnourishedButthenumberofcellsincreasesastheorganismpreparesforimplantationwhichissucceful13ofthetimeviFirststagesofthegerminalperiod1Zygotedividesinto2cells2Then4cells3Then8cells4IfthecellseparatescompletelyMonozygotictwinsectrdthbEmbryoFromthe3Throughthe8WeekiEmbryoticperiodthefirstsatgeofprenataldevelopmentfromrdthapproxthe3throughthe8weekduringwhichthebasicformsofallbodystructuresincludingenternalorgansdevelop1TheblastocytestartstobecomeadistinctbeingrdiiEmbryothenameforadevelopingorganismfromaboutthe3th8weekafterconception1Notrecognizablyhuman2PrimitivestreakThefirstsignofhumanbodystructuresappearsasathinlinedownthemiddleoftheembryord33WeekaNeuraltubethelinebecomesthisafter22daysafterconceptioneventuallydevelopingthenervoussystemth44WeekaHeadbeginstotakeshapeasearsnoseandmouthformbMinisculebloodvesselsbecomethepumpingheartfirsttimetoseecardiovascularactivityth55WeekaBudsappearthatwillbecomearmsandlegsiUpperarmsforearmswebbedfingersiiLegsfeetwebbedtoesiiiEachwiththebeginningofaskeletalstructure67thWeekaToesandfingersseparate5254daysth78Week
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