44 - Coronary sinus

*The coronary sinus is a collection of veins joined together to form a large vessel that collects blood from the myocardium of the heart.
*It is present in humans and other animals.
*The coronary sinus opens into the auricle, between the inferior vena cava and the auriculo-ventricular opening.
*It returns the blood from the substance of the heart, and is protected by a semicircular fold of the lining membrane of the auricle, the coronary valve. ( valve of Thebesius).
*The sinus, before entering the auricle, is considerably dilated - nearly to the size of the end of the little finger.
*Its wall is partly muscular, and at its junction with the great coronary vein is somewhat constricted and furnished with a valve consisting of two unequal segments.

*It is located in the right atrium and runs transversely in the groove between the left atrium and ventricle on the posterior surface of the heart.
*The coronary sinus orifice (opening) is just superior to the septal leaflet of the tricuspid valve.
*The coronary sinus orifice is also known as the ostium of the coronary sinus, and is guarded by the Thebesian valve.

*It receives blood mainly from the small, middle, great and oblique cardiac veins.
*It also receives blood from the left marginal vein and the left posterior ventricular vein.
*The anterior cardiac veins drain directly into the right atrium. (Some small veins drain into any of the four chambers of the heart.)
*It drains into the right atrium on the posterior, inferior surface, medial to the inferior vena cava opening.

43 - Adductor canal (Subsartorial/Hunter's canal)

*The adductor canal (Subsartorial/Hunter’s canal) is an aponeurotic tunnel in the middle third of the thigh, extending from the apex of the femoral triangle to the opening in the Adductor magnus, the Adductor hiatus.

*It courses between the anterior compartment of thigh and the medial compartment of thigh, and has the following boundaries:

1. anterolaterally - the Vastus medialis.
2. posterior - the Adductor longus. It is covered in by a strong aponeurosis which extends from the Vastus medialis, across the femoral vessels to the Adductor longus and magnus.

Lying on the aponeurosis is the Sartorius muscle.

*The canal contains the femoral artery, femoral vein, and branches of the femoral nerve (specifically, the saphenous nerve, and the nerve to the Vastus medialis).

*Named after JOHN HUNTER.