Mesoderm, specifically the visceral mesoderm layer consisting of mesoderm and endoderm.

From inner to outer, the germ cell layers are the endoderm, mesoderm, and ectoderm.

Each of the three layers develops into a different part of the embryo: the endoderm into the respiratory, auditory, and digestive system; the mesoderm into the skeleton and muscles; and the ectoderm into the skin, tooth enamel, and nervous system.

A mesoderm is a middle layer of the zagote(one of three layers)

The three systems that developed in the mesoderm of the planarians are ectoderm, mesoderm, and endoderm. They are usually described as the three germ layers.

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