<prompt> Diaphragm develops from -EctodermMesodermEndodermNeuroectoderm  <response>: Ans. is bi.e., Mesoderm Development of diaphramo Diaphragm develops from 4 structures derived from mesoderm which unite to form a sheet.1 Septum transversum:- Gives origin to sternal part and central tendinous region.2 Pleuroperitoneal membrane:- Dorsal paired portion.3 Dorsal mesentry of oesophagus:- Gives origin to crural part Dorsal unpaired portion.4 Lateral body walls from cervical myotome:- Gives origin to peripheral costal portion of diaphragm. 