Thorax Diaphragm Pathway Notes

1. Diaphragm Pathways 
1. Blood Supply 
1. Aorta  aortic arch  left subclavian or brachiocephalic to right subclavian  internal thoracic  pericardiophrenic  superior surface of diaphragm 
2. Descending aorta  inferior phrenic 
2. Blood Drainage 
1. Inferior diaphragm  inferior phrenic  IVC
2. Superior diaphragm  pericardiophrenic  brachiocephalic  SVC
3. Nerves 
1. Efferent 
1. Somatic 
1. Respiratory center in medulla  spinal cord  C345  cervical plexus  phrenic nerve
2. Autonomic 
1. N/A
2. Afferent 
1. Somatic 
1. Upper and lower surface of diaphragm  upward through phrenic nerve C345 dorsal roots  spinal cord  medulla 
2. Lower diaphragm  intercostal nerve  dorsal root T spinal nerves