- incorporates derivatives of :
- septum tranversum
- pleuroperitoneal membranes
- paraxial mesoderm
- esophageal mesenchyme
- myoblasts from septum tranversum migrate into pleuroperitoneal membrane taking phrenic
nerves with them
- septum transversum mainly forms central tendon of diaphragm
- bulk of pleuroperitoneal muscle innervated by phrenic nerves
- outer side rim of muscle develops from paraxial mesoderm from body wall hence has
segmental innervation (T7 to T12)
- forgut mesenchyme gives rise to muscle of and around crura
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