Now, the lungs, and more specifically the epithelial layer of the lungs is also formed from the endoderm as well as the epithelial of our reproductive ducts, our reproductive system, our urethra and our bladder. So to summarize, our ectoderm basically forms the outer portion of the skin as well as some organs found inside of our body. And that takes place because a lot of these ectodermal cells actually invaginate and end up inside that developing embryo. Now, the mesoderm forms everything in the middle so that includes the muscle, the cardiovascular system, the skeletal system, the reproductive organs, our gonas, the connective tissues. So bone and cartilage. We have the dermis of the skin, we have the adrenal cortex and the endoderm basically forms the majority of the epithelium, the epithelial layer of our body.