Anatomy - Thorax

Question 1

Right atrium - outside

Answer 1

Antero-MEDIAL to LA
Posterior wall - inter ventricular septum
Sulcus terminalis (from crista terminalis) - separates auricle from atrium

Question 2

Right atrium - inside

Answer 2

RIGHT of crista terminalis - pectinate muscles (primitive atrium)
LEFT of crista terminalis - sinus venarum (site of IVC/SVC/Coronary sinus drainage)
Fossa ovalis - INFERIOR part of interatrial septum
Coronary sinus opening - to LEFT of IVC, below fossa ovalis

Question 3

Left atrium - outside

Answer 3

Lies POSTERO-LATERAL to RA

Question 4

Left atrium - inside

Answer 4

Completely smooth walled

Left atrial appendage - common site of thrombus formation in AF

Question 5

Right ventricle - outside

Answer 5

Projects to LEFT of right atrium

Question 6

Left ventricle - outside

Answer 6

Thick walls - 2x thick as RB

Question 7

Left ventricle - inside

Answer 7

Trabeculae carnae - ridges, attachment of chordate tendinae
Mitral valve - BICUSPID (anterior, posterior cusps)
IVS - bulges to RIGHT
- Long thick muscular component inferiorly, short thin membranous component superiorly
Aortic vestibule
- Aortic valve - semilunar (posterior, left, right)