Dr Adel Bondok Anatomy Teaching Videos. It describes the muscles of respiration: the 3 layers of the intercostal muscles and the diaphragm.
Development of the Diaphragm: 5 sources
1. Septum transversum forms the central tendon.
2. Cervical myotomes: 3rd, 4th & 5th invade septum transversum to form the muscle fibers.
3. Pleuroperitoneal membrane forms the dorsolateral part.
4. Dorsal mesentry of the esophagus forms the crura.
5. Mesenchyme of the chest wall forms the marginal part; costal origin.