<prompt> All of the following muscles are derivatives of para axial mesoderm except-Masseterdiaphragmbiceps femorisdetrusor  <response>: Para axial somite derivatives- dermatome lateral pa- skin dermis myotome middle pa- skeletal muscles sclerotome medial pa- bone veebrae, occipital skull bone option 1,2 and 3 are skeletal muscles. Detrusor is a smooth muscle of genitourinary system derived from intermediate mesoderm. 