The ostium of the posterior vein of the left ventricle is typically near the
distal end of the coronary sinus. In most human hearts we have observed a
partial valve associated with this ostium, as this venous drainage enters
the coronary sinus.
This cardiac vein returns deoxygenated blood (metabolic waste products) from
the lateral wall of the left ventricle.
Importance in device delivery:
Left heart pacing can be achieved via placing leads into this vein; often
one will try to access branches that are more posterior-lateral.