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What is Ribs develop from: and explain in detail?
Ans. B Para-axial mesenchymeRef: Gray's Anatomy, 41st ed. pg. 212* The axial skeleton, vertebrae and ribs are derived from paraxial mesenchyme* The skull is derived from paraxial mesenchyme and neural crest mesenchyme* The skeletal elements in the limbs are derived from somatopleuric mesenchyme, which forms the limb buds.