Template:Spleen Timeline Table

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Human Embryonic Spleen Development
Week
Carnegie Stage
Feature
Week 5
14
Carnegie stage 14 to 17

appears as a bulge in the dorsal mesogastrium. Mesothelium pseudostratified.

15
Week 6
16
Mesothelium (pseudostratified} replaced with high columnar cells and then low columnar cells.
17
Basement membrane present after this stage.
Week 7
18
Hematopoietic cells detected.
Week 8
20
Spleen is now apparent. Mesenchymal cells differentiated from cells in dorsal mesogastrium. Sinus and hilus formation after this stage.
23
Arteries and veins parallel entries at this stage.
Human data.[1]    Links: spleen | Kyoto Collection | Timeline human development
  1. Endo A, Ueno S, Yamada S, Uwabe C & Takakuwa T. (2015). Morphogenesis of the spleen during the human embryonic period. Anat Rec (Hoboken) , 298, 820-6. PMID: 25403423 DOI.