Hello fellow Bilateral Triploblast.

Hello fellow Bilateral Triploblast.
Mesoderm becomes the muscles and connective tissues.
Ectoderm becomes skin.
Endoderm becomes digestive system.
A fourth part, not really a layer, not shown, eventually becomes parts of the gonads.

Triploblasty is a condition of the gastrula in which there are three primary germ layers: the ectoderm, mesoderm, and endoderm. A fourth “layer” consists of the germ cells that are set aside in the embryo at the blastula stage, which are incorporated into the gonads during organogenesis. The germ layers form during gastrulation of the blastula. Additionally, the term may refer to any ovum in which the blastoderm splits into three layers.[1] All “higher” and “intermediate” animals, from flatworms to humans, are triploblastic and belong to the Bilateria subregnum. Simpler animals qualified as diploblastic, such as cnidaria (which includes jellyfish, corals and hydra), possess two germ layers. Simpler animals, such as sponges, contain no “true” tissues as such, but have mainly two layers: pinacoderm, choanoderm, and a sandwiched mesohyl where totimpotent archaeocytes roam, having an immune and digestive function. Triploblasts emerged within the Diploblasts.

https://en.wikipedia.org/wiki/Triploblasty

 
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What’s our Mesoderm?
Some of the mesoderm derivatives include the muscle (smooth, cardiac and skeletal), the muscles of the tongue (occipital somites), the pharyngeal arches muscle (muscles of mastication, muscles of facial expressions), connective tissue, dermis and subcutaneous layer of the skin, bone and cartilage, dura mater, endothelium of blood vessels, red blood cells, white blood cells, and microglia, Dentine of teeth, the kidneys and the adrenal cortex
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