Embryology Timeline - Lecture notes 1 PDF

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EMBRYOLOGYTI MELI NE soonaf t erf er t i l i sat i on

- zygot esunder goescl eavage - si ngl ecel l di vi desi nt obl ast omer es - t henumberofcel l si ncr ease,t hesi z eoft hecel l sdec r ease,t hevol umeoft heembr yo r emai nst hesame

- zonapel l uci damai nt ai nst hevol umeoft heembr y o day45ofdev el opment - cavi t at i on - f or mat i onoft hebl ast ocys tcavi t y day7

- hat chi ng - bl ast oc y sthat chesf r om t hez onapel l uci daandadher est oendomet r i um ear l ysecondweekofdevel opment

- i nnercel lmassdi ffer ent i at esi nt oepi bl as tandhypobl ast endofsecondweekofdev el opment - f or mat i onofext r aembr y oni cmes oder m - syncyt i alandcel l ul art r ophobl astbegi nst of or m chor i oni cvi l l i secondt hi r dweekofdev el opment

- yol ksac - nour i shest heembr y o - pr ov i desbl oodcel l st ot heembr y o - gi v esr i s et ot heger ml i net hatwi l lmi gr at ei nt ot hegonads bet weensecondandf our t hweekofdev el opment

- phar yngealar chesappear s - pai r edsegment eds t r uct ur est hatdev el oponeachsi deoft heembr y oatt hel evel oft he f ut ur eheadandneckr egi ons day15af t erf er t i l i s at i on

- gast r ul at i on - t hepr oc essbywhi cht hebi l ami narembr y oi st r ansf or medi nt oonet hathast hr eeger m l ay er s

- ect oder m,mesoder m,endoder m - al lt hr eeger msl ay er sar eder i v edf r om t heepi bl astpr oper - t hefi r stsi gnofgast r ul at i oni st hef or mat i onoft hepr i mi t i vest r eak day16af t erf er t i l i s at i on

- cel l smi gr at i ngt hr ought her ost r alt i poft hepr i mi t i vest r eakwi l lst ar tposi t i oni ngt hems el vesat t hemi dl i nef or mi ngames oder malr od[ not ochor d] day18af t erf er t i l i s at i on

- cel l sst opmi gr at i ng - st r eakr egr esscaudal l y - mesoder m cont i nuest obef or med

day20

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day23

t owar dst hi r dweekofdev el opment

- l at er alpl at emesoder m spl i t st of or mt wosheet s - vi scer al[ spl achni c ]l at er al pl at emesoder m - par i et al[ somat i c]l at er alpl at emesoder m t hi r dweekofdev el opment

- br ai nandspi nalcor dder i v ef r om neur alpl at e - f usi onoft wohear tpr i mor di alt ubest of or m asi ngl et ube endoft hi r dweekofdevel opment -ext r aembr yoni cmesoder ms t ar t sf or mi ngbl oodv ess el s ,capi l l ar i esandbl oodcel l swi t hi nt he chor i oni cvi l l i f our t hweekofdev el opment

- vest i gesoft hepr i mi t i v est r eakc anbeseenwel li nt ot hef our t hweekofdev el opment - or ganf or mat i onbegi ns - embr yos hapec hanges - t hr oughapr ocesscal l edembr yoni cf ol di ng - f ol di ngi st her esul tofdi ffer ent i algr owt h - el ongat edov aldi sc—>t hr eedi mensi onalst r uct ur e - r ost r alr egi onofneur alt ubeexhi bi t st hr eeflui dfil l edbr ai nv esi cl esorenl ar gement s - f or ebr ai n,mi dbr ai nandhi ndbr ai nvesi cl es - pr i mi t i v event r i cl eoccupi esmostcaudalapexoft hehear tbyt hef our t hweekofdev el opment endoff our t hweekofdev el opment

- f aceoft heembr y oconsi st sof5i ni t i alswel l i ngs[ f aci alpr omi nences] onemont hpost f er t i l i s at i on

- 3Dst r uct ur eofembr y or es embl est hest r uct ur eofat ypi calv er t ebr at e - or ganss t i l lhav ear udi ment ar yst r uct ur e f our t ht ofif t hweek

- hear thast wochamber s;oneat r i um andonev ent r i cl e fi f t hweekofdev el opment

- t het wonasalpl acodes[ l at er al nas al / medi al nasalpr omi nence]si nkt of or mt wopi t st hatwi l l ev ent ual l ybecomet henost r i l s OTHERI MPORTANTEVENTS

- hear ti st hefir s tf unct i onalor gant odev el opi nt heembr y o...