Which organs are mesoderm and which or endoderm?

[GomerPyle]

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Kind of confused on how to differentiate between organs and germ layers. Endo includes liver, pancreas, bladder, thyroid, and lungs while meso includes heart and other organs in excretory system (i thought bladder was an excretory organ so why isn't it meso?).

 

[jakernewt]

https://en.wikipedia.org/wiki/Germ_layer#Endoderm

give that a read.

Meso = Heart, Circulatory System, Skeletal Muscle, Kidney
Ecto = Brain, Neuro, Skin, Teeth
Endo = GI tract and it's organs (except mouth), liver, lungs, land down unda, thyroid glands

 

[coolio93]

Kind of confused on how to differentiate between organs and germ layers. Endo includes liver, pancreas, bladder, thyroid, and lungs while meso includes heart and other organs in excretory system (i thought bladder was an excretory organ so why isn't it meso?).

Ecto is everything you can see from the outside of the body + the nervous system.

Endo is the respiratory tract and digestive tract plus its respective organs (liver, spleen, pancreas, gallbladder) and the urinary bladder


Meso is everything else

so you basically just have to memorize the endoderm and everything else is pretty straightforward.

 

[catzzz88]

Here is the EK mnemonic for this info. Hope it helps you.

EK calls mesoderm "means"-o-derm - how we get from place to place in the world and how constituents get from place to place in the body. Bone, muscle, heart all allow us to move around. Blood vessels and kidney tubules allow fluid to move around in our body.

EK calls ectoderm "attract"-o-derm - systems and organs that attract us to other people. Their looks (anything on outside of body like skin, ears, hair, nails etc), their teeth, their eyes, and their brains!

EK calls endoderm "endernal" organs - digestive tract, lungs, etc.

Best,
C