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===Dorsal - Ventral Patterning===
 
===Dorsal - Ventral Patterning===
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*Important for the proper development of both internal and external structures:
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:Internal - muscle and bone
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:External - hair, nails, footpads
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*This requires control over the ectoderm and mesoderm.
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*It is the ectoderm which controls dorsal - ventral patterning.
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**It achieves this by coordination of it's own patterning with the underlying mesoderm i.e. dorsal ectoderm gives rise to dorsal mesoderm.
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*Dorsal - ventral patterning controls the positioning of the AER as it exists at the boundary of the dorsal and ventral aspects.
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