Ribs develop from:: (A) Endothoracic fascia, (B) Para-axial mesenchyme, (C) Deep intercostal fascia, (D) Superficial intercostal fascia
Answer is B. 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.