Thorax Posterior Heart Pathways Notes

1. Posterior Heart Pathways 
1. Blood Supply 
1. Left ventricle  aortic valve  right or left coronary arteries 
1. Right coronary artery  posterior descending artery 
2. Left coronary artery  posterior left ventricle 
2. Blood Drainage 
1. `Middle cardiac vein  coronary sinus  RA
2. Posterior vein of left ventricle  coronary sinus  RA
3. Nerve Supply 
1. Afferent 
1. Somatic 
1. N/A
2. Autonomic 
1. Parasympathetic 
1. Chemoreceptors and baroreceptors in great vessels  ascending fibers of vagus  jugular foramen  CV and respiratory centers of medulla 
2. Sympathetic 
1. Pain receptors in myocardium  ascending fibers through sympathetic cardiac nerves  sympathetic trunk ganglion  white rami  thoracic spinal nerves  dorsal root of spinal cord  anterolateral paths
2. Efferent 
1. Somatic 
1. N/A
2. Autonomic 
1. Parasympathetic 
1. Medulla  vagus  jugular foramen  thoracic vagal cardiac nerves  cardiac plexus  syn to postganglionic fiber  SA node, AV node, coronary arteries 
2. Sympathetic 
1. IML  ventral root  thoracic spinal nerves  white rami  sympathetic ganglion  ach synapse  postganglionic fiber  SA node, AV node, coronary artery, myocardium