Ribs are developed from ?: (A) Cloaca, (B) Sclerotome, (C) Endodermal cloaca, (D) Primitive gut
Answer is B. Ribs are derived from lateral cells of sclerotome.Derivatives of paraxial mesoderm Paraaxial mesoderm is organized into somites which in turn gives rise toi) Sclerotomes : Form axial skeleton including veebrae, ribs and pas of neurocranium.ii) Myotomes : Form all voluntary (skeletal) muscles of head, trunk and limbs.iii) Dermatomes : Form dermis of skin, especially over dorsal regions.