What is the Difference Between Somatic and Splanchnic Mesoderm?

The main difference between somatic and splanchnic mesoderm lies in their position and function within the developing embryo.

Somatic Mesoderm:

• Forms the outer layer of the lateral plate mesoderm.
• Adheres to the ectoderm to become the somatic or parietal layer, known as the somatopleure.
• Contributes to the formation of connective tissue in the body wall and limbs.

Splanchnic Mesoderm:

• Forms the inner layer of the lateral plate mesoderm.
• Adheres to the endoderm to become the splanchnic or visceral layer, known as the splanchnopleure.
• Gives rise to the mesothelial covering of the visceral organs.

In summary, somatic mesoderm is the outer layer of the lateral plate mesoderm that adheres to the ectoderm and contributes to the connective tissue of the body wall and limbs. In contrast, splanchnic mesoderm is the inner layer of the lateral plate mesoderm that adheres to the endoderm and gives rise to the mesothelial covering of the visceral organs.

Comparative Table: Somatic vs Splanchnic Mesoderm

Here is a table comparing the differences between somatic and splanchnic mesoderm:

Both somatic and splanchnic mesoderm are derived from the lateral plate mesoderm, which splits during embryogenesis. The combination of ectoderm and somatic mesoderm typically forms the amnion, while the splanchnic mesoderm contributes to the formation of internal organs, such as the heart and circulatory system.