What are the four regions of mesoderm and what do they give rise to?
1. axial (chordamesoder) = notochord
2. paraxial mesoderm = head, myotome = skeletal muscle (myotome), dermatome (dermis), sclerotome (cartilage)
3. intermediate mesoderm = kidney (nephrotomes, nephrogenic chord), gonads (urogenital structures)
4. lateral mesoderm = parietal mesoderm (somatic) = body walls & thin serous membrane around body cavities, visceral mesoderm (splanchnic) = gut wall, & thin serous membranes around each organ