The developmentof CentralSimpleintestine(midgut)
The developmentof CentralSimpleintestine(midgut)
the development of
thegutwascharacterizedbyrapidandprolongedintestinalmesenteriumnya,thus
formingthe primaryintestinalmeshes.
Cranialpart ofthe intestineto formmeshes:- The distalduodenum-
jejunal- Ileum(part) Caudalpart ofthe intestineto
formmeshes:-Bottomilleum-Caecum-Appendix-ascendingcolon-2/3proximalcolontransfersum
The border
betweenthecranialandcaudalgutsnares:vitellinusductassociatedwithbladderegg
Primarygrowthis very rapidgutsnares, especially
thecranialnya.Due tothis rapid growthandexpansion of
theheartsimultaneously,the abdominal cavityfor
awhiletoosmalltoaccommodatethesesnares,gutsnares.As a resultof
thismeshesintocelomextraembryonicandumbilical
cord(umbilicalherniaphisiologic)that occurredat weeksix.
Togetherwithlongitudinalgrowth,a simplegutsnarewillrevolvearound
theaxisformed by thesuperiorA.Mesenterica.
270 degreerotationoccurswhich consists of:- 90degreesduring
theherniation- 180degrees formeshesintestinebackinto the abdominal
cavity.Rotationisoppositeto the direction ofclockEnd
ofthethreemeshesstartingbowelherniationbackinto
theabdominalcavity.Partproximaljejunumisthe firstpartin
andtakeplaceon the left. The
nextincomingmeshesincreasinglysettlingon the right.
From here thecaecumbubblesmove downinto
therightfossailiaca,while establishing:- ascendingcolon-
Flexurahepatica Duringthis processthe distal end ofthe
bubblecaecumformed anarrowdiverticulum:-Appendixa simple
Appendixcolondevelopsduring the downturn,so
thelastpositionthere:behind thecaecumbehind thecolon
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