Paraxial Mesoderm

By the beginning of the third week, paraxial mesoderm is organized into segments. These segments, known as somitomeres, first appear in the cephalic region of the embryo, and their formation proceeds cephalocaudally. Each somit-omere consists of mesodermal cells arranged in concentric whorls around the center of the unit. In the head region, somitomeres form in association with

Somitomere

Somite

Amnion

Neural groove

Parietal mesoderm layer

Visceral mesoderm layer

Amnion

Neural groove

Neural Groove

Intra-embryonic body cavity

Endoderm

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