Changes

===Dorsal - Ventral Patterning===

===Dorsal - Ventral Patterning===

*Important for the proper development of both internal and external structures:

Dorsal - ventral patterning is important for the proper development of both internal and external structures; particularly muscles and bones internally and hair, nails and footpads externally. This form of patterning requires control over the ectoderm and mesoderm, although it is the ectoderm which controls dorsal - ventral patterning. It achieves this by coordination of it's own patterning with the underlying mesoderm, i.e. the dorsal ectoderm gives rise to dorsal mesoderm.Dorsal - ventral patterning controls the positioning of the AER as it exists at the boundary of the dorsal and ventral aspects.

:Internal - muscle and bone

:External - hair, nails, footpads

*This requires control over the ectoderm and mesoderm.

*It is the ectoderm which controls dorsal - ventral patterning.

**It achieves this by coordination of it's own patterning with the underlying mesoderm i.e. dorsal ectoderm gives rise to dorsal mesoderm.

*Dorsal - ventral patterning controls the positioning of the AER as it exists at the boundary of the dorsal and ventral aspects.

[[Category:Developmental Biology]][[Category:Musculoskeletal System - Anatomy & Physiology]]

[[Category:Developmental Biology]][[Category:Musculoskeletal System - Anatomy & Physiology]]

[[Category:To Do - Chris Burton]]

[[Category:To Do - Chris Burton]]