Each myotome splits first into a dorsal epimere and ventral hypomere. The epimere forms deep muscles of the back. In the thoracic region, the hypomere splits into three layers of anterolateral muscles; in the abdomi- nal region, a fourth ventral segment also differentiates and forms the rectus abdominis muscle.
What cells form the mesoderm?
Mesoderm
- The mesoderm is the middle layer of the three germ layers that develop during gastrulation in the very early development of the embryo of most animals. ...
- The mesoderm forms mesenchyme, mesothelium, non-epithelial blood cells and coelomocytes.
Which cells become the gastrula?
gastrula, early multicellular embryo, composed of two or more germinal layers of cells from which the various organs later derive. The gastrula develops from the hollow, single-layered ball of cells called a blastula which itself is the product of the repeated cell division, or cleavage, of a fertilized egg.
