Misc. Heart Flashcards
What is an important surgical landmark for bypass?
Transverse sinus
Sternocostal surface
R ventricle
Diaphragmatic surface
both ventricles, primarily the left
Pulmonary surface
L ventricle, occupies cardiac notch
Right border
R atrium
Inferior border
R ventricle, apex of L ventricle
Left border
L ventricle, L auricle
Superior border
R and L auricles, conus arteriosus
Characteristics of cardiac skeleton
- fibrocartilagenous tissue
- divides atria from ventricles
- provides barrier b/w A & V for conductive system
- provides attachment for heart valves and myocardium
What does the tendon of conus arteriosus connect?
Aortic to pulmonary semilunar valves
Left fibrous trigone
Mitral valve to aortic semilunar valves
Right fibrous trigone
AV valves to aortic semilunar valves
R coronary contribution to SA/AV nodes
- 60% supplies SA node
- supplies AV node
L coronary a contribution to SA/AV nodes
40% SA node
SA node
- initiates impulse for contraction
- 70-80 bpm
- located at junction of SVC and R atrium
AV node
- 40-60 bpm
- located at posteroinferior region of interatral septum, near coronary sinus
- collects impulses from atria and distributes to ventricles
AV bundle (purkinje fibers)
- 20-40 bpm
- located w/i IV septum to ventricular myocardium
- divides into right and left bundle branches
Innervation of heart
sympathetic trunks
vagus (parasympathetic)
Ausculatory area for aortic semilunar valve
R 2nd intercostal space
Ausculatory area for pulmonary semilunar valve
L 2nd intercostal space
Ausculatory area for tricuspid valve
lower left body of sternum
Ausculatory area for mitral valve
L 5th intercostal space
