July 17th, 2009


Germinal Layers

A human embryo starts out as three layers of tissue known as the ectoderm, mesoderm and endoderm. Most of us know, if we know anything about embryology at all, that the ectoderm becomes the nervous system and skin, the mesoderm becomes the bones and muscle, and the endoderm becomes the gut. But let's get more specific.

What layer originates the parenchyma of the tonsils and thymus?
Ectoderm? Mesoderm? or Endoderm??
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