Ribs develop from ?: (A) Endothoracic fascia, (B) Para axial mesenchyme, (C) Deep intercostal fascia, (D) Superficial intercostal fascia
Answer is B. Ribs which are attached to veebra posteriorly is derived from paraxial mesenchyme which is derived from mesoderm. Mesoderm - Paraxial Mesoderm, Intermediate Mesoderm, Lateral plate Mesoderm Paraxial mesoderem forms somites -sclerotome, myotome and dermatome. Sclerotome forms veebra and ribs. Myotome forms skeletal muscles. Dermatomeforms dermis(skin)