part of part of develops from mesenchyme head mesenchyme from mesoderm 1st arch mandibular mesenchyme 1st arch mandibular mesenchyme from head mesenchyme 1st arch mandibular mesenchyme from head mesenchyme Mesenchyme that develops_from a head mesenchyme from mesoderm and is part of a 1st arch mandibular mesenchyme. EHDAA2:0000036 UBERON:0010339 1st arch mesenchyme from head mesenchyme