Somites

1
Somites

• Form sequentially from anterior to posterior

2
7.3
3
Somites Form

• Sclerotome
• Vertebral column and ribs
• Dermatome
• Dermis
• Myotome
• Muscle

4
7.4
5
Tissue Interactions Induce Somite Differentiation
6
7.5
7
Signaling Molecules Influence Somite
Differentiation
8
7.7
9
Lateral Intermediate Mesoderm Forms

• Kidney
• Gonads

10
7.10
11
7.11
12
Evolution and Kidney Formation

• Pronephros
• Agnatha (e.g., hagfishes) kidney
• Embryonic kidney in amphibians, fish, amniotes
• Mesonephros
• Adult kidney in amphibians and fish
• Embryonic kidney in amniotes
• Metanephros
• Adult kidney in amniotes

13
07_16
14
07_16_01
15
07_16_02
16
07_17
17
07_18