Flashcards in Anatomy of the heart Deck (70)
What is the innervation of the fibrous pericardium?
Phrenic nerve C3-C5
What are the four layers of the pericardium?
Parietal serous pericardium
Visceral serous pericardium
Another name for the visceral serous pericardium is what?
What structures does the transverse pericardial sinus separate?
Aorta and pulmonary trunk (outflow) from venous inflow vessels
Where is the oblique pericardial sinus found?
Posterior to left atrium
In what part of the heart wall are the vessels and nerves of the cardiac conducting system found?
What is the crista terminalis?
A ridge running from the opening of SVC to opening of IVC
Divides atrium in to vena cava sinus and atrium proper
What is the main structural difference between the sinus of vena cavae and atrium proper?
Sinus of vena cavae has smooth muscle walls, whereas atrium proper has rough muscular walls formed by pectinate muscles
What ventricular structure is homologous with the atrial pectinate muscles?
What structure separates the inflow and outflow portions of the right ventricle?
What are the three types of trabeculae carnae muscle? How are they identified structurally?
Ridges --> attached along entire length of ventricle
Bridges --> attached only at both ends
Pillars --> Base anchored to ventricular wall, apices attach to chordae tendinae to make up valve structures
The moderator band has important functions in cardiac conduction. What is its structure?
Trabeculae carnae bridge
How is the inflow portion of the RV disinguished structurally from the outflow portion?
Inflow has rough trabeculae carnae structures in its walls, outflow portion has smooth walls
What is the conus arteriosus?
Outflow portion of RV
What are papillary muscles?
Pillar shaped trabeculae carnae that are structural components of the tricuspid valves
How is the inflow portion of the LA distinguished structurally from the outflow portion?
Inflow portion has smooth surface (dervied from pulmonary endothelium)
Outlfow portion lined with pectinate muscles
What is different about the development of the inflow and outflow portions of each of the heart chambers?
Each inflow and outflow portion is embryologically distinct
How can RV be distinguished from LV in terms of structure?
Trabeculae carnae are thinner and more delicate in LV
LV has a thicker myocardium
What is the cardiac skeleton?
A ring of dense fibrous connective tissue in a plane between atria and ventricles
What are the four rings of the cardiac skeleton?
2 x rings around each atrioventricular oriface
Fibrous ring of pulmonary oriface
Fibrous ring of aortic oriface
What is the left fibrous trigone?
Thickened area of connective tissue that separates the aortic ring and left atrioventricular ring
What is the right fibrous trigone?
Thickened area of dense connective tissue separating the aortic ring and the right atrioventricular ring
What structure is found at the centre of the fibrous skeleton?
What are the functions of the cardiac skeleton?
To provide an attachment point for muscles and valves of the heart
Electrical isolation between atria and ventricles
What artery supplies the SA and AV node?
What does the RCA supply?
RV, LV SA and AV node
What does the RMA supply?
What does the PDA supply?
Portions of both RV and LV
What does the LCA supply?
LA, LV and parts of interventricular septum