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Fetal Circulation Assignment

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Added on  2021-01-13

Fetal Circulation Assignment

   Added on 2021-01-13

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Assignment2:FetalCirculation1.Describethefetoplacentalandmaternoplacentalcirculation(Beforewearebornessentialsofembryologyandbirthdefectspg74-75)A.Feto-placentalCirculation:Thefeto-placentalcirculationreferstotheexchangeofoxygenatedanddeoxygenatedbloodofthefetus.thefetusisconnectedtotheplacentaviatheumbilicalcordwhichcontainstheumbilicalarteriesandtheumbilicalvein.Theumbilicalveincarriesoxygenatedbloodtothefetus,whereastheumbilicalarteriescarrythedeoxygenatedbloodfromthefetustotheplacenta.Astheumbilicalarteriesandveinpassthroughtheumbilicalcordtheyformmanybranchedvesselslocatedwiththechorionicplate.After,thevesselsformacomplicatedarteriocapillaryvenoussysteminthechorionicvillilocatedintheintervillousspace.Thisiswheretheexchangeofbloodtakesplace.Thematernalandfetalblooddonotmix,butthroughthevesselsysteminthechorionicvilli,thereislargesurfaceareatoallowthetransferofgaseousandmetabolicnutrientsviathecapillaries.B.Meterno-placentalCirculation:referstothetransferofoxygenatedanddeoxygenatedbloodfromthemotherviatheplacentatoandfromthefetus.Theoxygenatedbloodenterstheintervillousspaceviathespiralarteries(endometrialartery)embeddedinthedeciduabasali.Thedeciduabasalicontainsapproximately80-100spiralarteries.Itentersatahighpressurewhichcausesthedeoxygenatedbloodintheintervillousspaceproducedbythefetustoenterintothematernalsystemviatheendometrialveins.Theoxygenatedblooddiffusesthegasesandmetabolicitemsintothevilli,andultimatelyreachesthefetusviatheumbilicalvein.
Fetal Circulation Assignment_1
2.Tracethe>lowofbloodinthefetalcirculation,andstatethefunctionofforamenovaleandductusarteriosus.(pg197-200,215-216,219)a.FetalCirculation:i.oxygenatedbloodfromplacentaviaumbilicalveintofetusii.1/2bloodtoIVCviaductusvenosusinlivesandotherhalftoIVCviahepaticveinsinsinusoidsofliver(shortperiod)iii.rightatriumoftheheartiv.mostbloodenterstheleftatriumasthebloodpassesthroughtheinferiorborderoftheseptumsecundum(cristadividens),throughtheovalforamenv.Bloodfromleftatriumtoleftventriclethenouttheascendingaortasupplyingoxygenatedbloodtotheheart,head,neck,andupperlimbsvi.BloodfromrightatriumPlowstorightventriclethenleavestheheartviathepulmonarytrunkvii.Itthenpassesthroughtheductusarteriosusintotheaortawhereitthenleavesthefetusviatheumbilicalarteriestotheplacenta
Fetal Circulation Assignment_2

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