C.C.A. Ductus caroticus (Disappeare) Rt. Subclavian a. The aortic arch Lt. subclavian a. Descending aorta Common iliac a. Degenerating 5th arch New branch of 6th arch Degenerating part of Rt dorsal aorta Degenerating dorsal part of Rt. 6th arch Ductus Arteriosus
transversum: It lies firstly infront the neck and forms central tendon. 2- Cervical myotomes (C3,4,5): Forms the muscular part around the central tendon and supplied by phrenic nerve. 3- Pleuro-peritoneal membrane: forms the postero-lateral parts of the diaphragm. 4- Meso-esophagus: forms the median posterior part. 5- Mesoderm of thoracic wall: forms the periphery of diaphragm. 6- Mesoderm around aorta: forms the crura.
failure of formation of pleuro-peritoneal membrane. • 2- Esophageal (Hiatus) Hernia: due to wide esophageal opening or short esophagus. • 3- Parasternal hernia (of Morgagni): wide gap between sternal and costal origin of diaphragm.