Heart Flashcards
Right side of heart receives ____ through ____
Poorly O2-blood through SVC & IVC
Right side of heart pumps…
De-O2 blood through pulmonary trunk aa to lungs for O2
Left side of heart receives ____ via ____ into ____
O2-blood
pulmonary vv —> L atrium
Left side of heart pumps…
O2-blood into aorta and aa of body
Chambers of the heart
- R & L atria = receiving chambers, pump blood into ventricles
- R & L ventricles = discharging chambers
Layers of the heart
Epicardium
Myocardium
Endocardium
Epicardium is formed by ____
Visceral serous pericardium
Myocardium is composed of ____
Cardiac muscle
Endocardium is composed of ____
Endothelium
Location of Apex
- inferolateral part of left ventricle
- lies posterior to left 5th intercostal space
Location of Base of the heart
- posterior aspect
- formed mainly by L atrium, faces bodies of T6-T9
- extends superiorly to bifurcation of pulmonary trunk & inferiorly to coronary sinus
Base of heart receives ____ veins in…
- pulmonary veins
- L atrium, SVC, IVC, R atrium
Anterior (intercostal) surface of heart is mainly formed by the ____
R ventricle
Diaphragmatic (inferior) surface of heart is formed mainly by the ____
L ventricle
Related to central tendon of diaphragm
Right coronary artery location
- Originates Superior to right cusp of aortic valve
- follows coronary sinus
Left coronary artery location
Originates superior to left cusp of aortic valve
Branches of right coronary artery
- SA nodal
- right marginal
- posterior interventricular
Branches of left coronary artery
- left interventricular artery
- circumflex artery
Veins of external surface of heart
- small, middle, great cardiac veins
- coronary sinus
Openings of right atrium
- SVC
- IVC
- opening & valve of coronary sinus
- tricuspid orifice
Great cardiac vein runs with the ____
Anterior interventricular artery
Small cardiac vein runs with the ____
Right marginal artery
Pectinate muscles
- Right atrium
- anterior muscular wall
Crista terminalis
- R atrium
- separation of muscular & smooth portions of atrial wall
Fossa ovalis
- Oval depression in interatrial septum
- remnant of embryological oval foramen
The conduction system of the heart consists of…
Sinoatrial (SA) node
Atrioventricular (AV) node
Sinoatrial node
- collection of cells in wall of R atrium (lateral to SVC)
- produces action potential causing heart to contract
Atrioventricular (AV) node
- connects atria & ventricles causing ventricles to contract through AV bundles
- located in interatrial septum near opening for coronary sinus
Chordae tendinae
Tendinous cords from papillary muscles attached to cusps
Function of Papillary muscles
Contraction tightens chordae tendinae and cusps of valve together
How many papillary muscles are in the right ventricle
3
Right atrioventricular valve
Tricuspid
Trabeculae carnae
- irregular muscular columns in heart wall in ventricles
- pull on chordae tendinae
- contraction of heart wall
