somatopleure

anatomy

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July 14, 2026

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The somatopleure is a crucial embryonic tissue layer in vertebrates. It's a fold composed of the outer mesoderm and the ectoderm that covers it. This combination gives rise to important structures like the amnion and chorion, which are protective membranes surrounding the developing embryo.1

During embryonic development, the mesoderm, one of the three primary germ layers, differentiates. A portion of this mesoderm, known as the somatopleuric mesoderm, forms the outer layer of the future body wall. This layer plays a role in the development of the appendicular skeleton. The term "somatopleure" itself originates from Greek words relating to "body" and "side".21

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amnion
…of extra-embryonic tissue called the somatopleure. Lined with ectoderm and covered with mesoderm (both are germ layers), the amnion contains a thin, transparent fluid in which the embryo is suspended, thus providing a cushion against mechanical injury. The amnion also provides protection against fluid loss from the embryo itself and…
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…of extra-embryonic tissue called the somatopleure. Lined with ectoderm and covered with mesoderm (both are germ layers), the amnion contains a thin, transparent fluid in which the embryo is suspended, thus providing a cushion against mechanical injury. The amnion also provides protection against fluid loss from the embryo itself and…
Read More