Heart Flashcards
what happens to the phrenic nerves as they move towards the diaphragm
they become associated with the pericardium
describe the fibrous pericardium
- tough CT
- blends with tunica adventitia of great vessels (sup.)
- continuous with central tendon of diaphragm (inf.)
describe the serous pericardium
- line inside of fibrous pericardium (parietal)
- reflected onto heart surface (serous)
what creates the 2 cardiac sinuses
arrangement of the serous pericardium
describe the transverse sinus
- arises due to development from heart tube
- narrow channel between inflow and outflow tubes
describe the oblique sinus
- posterior to heart
- veins of either side
what is the ligamentum arteriosum
fibrous remnant of the ductus arteriosus
what is the embryological function of the ductus arteriosus
allows communication between aorta and pulmonary trunk
what nerve runs posterior to the ligamentum arteriosum
left recurrent laryngeal nerve
where does the arterial supply of the heart come from
ascending aorta
what are the right coronary branches of the ascending aorta
- SA nodal
- right marginal
- posterior interventricular
- AV nodal
what areas do the right coronary artery branches supply
- R. atrium
- most R. ventricle
- SA and AV nodes
- post. 1/3 of IV septum
- part of L. ventricle
what are the left coronary branches of the ascending aorta
- anterior interventricular (LAD) –> diagonal artery
- circumflex artery –> left marginal
what areas do the left coronary artery supply
- L. atrium
- most of L. ventricle
- ant. 2/3 IV septum
- AV bundle
- part of R. ventricle
Describe venous drainage of the heart
all veins drain to coronary sinus
EXCEPTION - anterior cardiac veins drain directly to R. atrium
function and location of crista terminalis
- conducts electrical signals from SA node to AV node
- located sup. in R. atrium
function and location of musculi pectinati
increase contraction in atria
function and location of sinus venarum
- smooth
- R. atrium
- connects sup. and inf. vena cava
Describe the features of the left atrium
- featureless
- smooth
what type of valve is found in between the left atrium and ventricle
mitral valve
what type of valve is found between the right atrium and ventricle
tricuspid valve
function and location of chordae tendineae
- anchor atrioventricular valve
- found on ventricle wall
function and location of papillary muscle
- prevent valves from opening when ventricles contract
function and location of trabeculae carnae
- most likely function is to prevent suction
- muscular ridges on wall
