BIO Q - which forms first??

[flycd05]

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During the formation of the 3 gastrula layers - what is order of them forming? Is it Ectoderm, Endoderm, then Mesoderm? b/c according to shaum's, it says that the nerve tube is the earliest organ formed in vertebrates that comes from the ectodermal portion overlying the notocord.

i'm confused on what forms first - i would think its endoderm b/c its the innermost layer but now i have no clue lol.

can someone explain this please? thanksss

 

[jdent]

During the formation of the 3 gastrula layers - what is order of them forming? Is it Ectoderm, Endoderm, then Mesoderm? b/c according to shaum's, it says that the nerve tube is the earliest organ formed in vertebrates that comes from the ectodermal portion overlying the notocord.

i'm confused on what forms first - i would think its endoderm b/c its the innermost layer but now i have no clue lol.

can someone explain this please? thanksss

Wikipedia says its endo, meso then ecto

 

[drzakisadiq]

Check out this website for an animated tutorial. This helped me out.
http://bcs.whfreeman.com/thelifewire/pages/bcs-main.asp?v=category&s=00020&n=01000&i=01020.01&o=|00510|00570|00520|00530|00540|00550|00580|00130|00PRS|00560|00590|00010|00020|00030|00040|00050|00060|00070|00120|00080|00090|00100|00110|01000|02000|03000|04000|05000|06000|07000|08000|09000|10000|11000|12000|13000|14000|15000|16000|17000|18000|19000|20000|21000|22000|23000|24000|25000|26000|27000|28000|29000|30000|31000|32000|33000|34000|35000|36000|37000|38000|39000|40000|41000|42000|43000|44000|45000|46000|47000|48000|49000|50000|51000|52000|53000|54000|55000|56000|57000|58000|99000|

 

[yakuza]

During gastrulation, Ecto forms first, then endo. Then mesoderm forms between those two at the end of gastrulation.