<prompt> Ribs are developed from ?CloacaSclerotomeEndodermal cloacaPrimitive gut  <response>: 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. 