Hola guys!

I disappeared again... I simply had a lot of problems with the computer... A wonderful bolt of lightning during a storm that fried my entire house system including the old PC... Wonderful days I would say... 🫠

Ok Well...

The good news is that I restored almost everything! I have a new PC and I should be back soon and running drawing...

As soon as I come home I'm gonna sit behind my desk and study like a good student.

Reality:

Primary germ layers are the three layers of cells that are established during gastrulation. (There’s a whole other part on embryonic development and how we go from a fertilized egg to a person but I’ll save that for a different time.)

http://forums.studentdoctor.net/proxy.php?image=http%3A%2F%2Fsnag.gy%2FiMuUm.jpg&hash=43474dd5b0a6c0360cdb95677c2b19de

Gives rise to:Ectoderm: outermost layer

Integument: epidermis, hair, nails

Epithelia of the nose, mouth, and lower anal canal

Nervous system

Lens of the eye

Inner ear

Adrenal medulla

Mesoderm: middle layer

Gives rise to:

Musculoskeletal system

Circulatory system

Most of the excretory system (kidneys)

Gonads

Muscular and connective tissue layers of the digestive and respiratory systems

Adrenal cortex

Endoderm: innermost layer

Gives rise to:

Epithelial linings of the digestive and respiratory tracts (lungs)

Pancreas

Thyroid

Bladder

Distal urinary tracts

Parts of the liver

Now, how do you memorize this aside from staring at it hopelessly at 10:00PM at night and wondering why this has become your life?

Kaplan Mnemonic: 

Ectoderm- “attracto”derm (things that attract us to others, such as cosmetic features and “smarts”)

Mesoderm- “means”oderm (means of getting around as an organism, such as muscles and bone, and means of getting around in the body, such as the circulatory system, and means of getting around, such as the gonads)

Endoderm- linings of the “endernal” organs (digestive and respiratory tract, and their accessory organs attached to these systems)

Premed Forums: 

ECtoderm- Epithelial and Communication systems (nervous system)

Mesoderm- Moving structures (muscle, bone, ligament, cartilage, blood)

Endoderm- Excretory structures (gastrointestinal, respiratory, urinary)

These are by no means comprehensive and if you’ve noticed, doesn’t account for everything in the body. So, good luck with that. The germ layers are complicated so don’t worry if you don’t get it right away!