[Small veins of the heart auricle]

A rich venous network in the atria of the human heart, has been demonstrated by the "corrosion-fouille" technic with direct injection. The atrial veins may be arranged in 2 main groups:--the group of the Coronary Sinus for the left atrium.--the group of venae cordis parva for the right atrium (1), the interatrial septum and the neighbouring parts of the left atrium. The venae cordis parva may be subdivided into:--those descending to the right atrio-ventricular sulcus and ending in the right atrium or in a "right coronary collecting channel" (2) (small cardiac vein, Adachi common channel, Parsonnet subendocardial vein of the right atrium).--and those opening by the Lannelongue foramina into the right atrium. Are described 4 principal foramina and veins, arranged in 2 groups:--the group of the S.V.C. ostium, corresponding to the Superior Atrio-Septo-Nodal artery, with 3 veins, the Anterior Lateral vein (or vein of the cavo-auricular notch) for the Sino-Atrial node, descending along the sulcus terminalis, the Anterior Superior and Posterior Superior veins for the interatrial septum, the adjacent parts of the right and left atria. The large ramus from the top of the left atrium, a tributary of the Posteror Superior Vein, corresponds to the homonymous collateral of the Superior A.S.N. artery.--the group of the Coronary Sinus ostium, corresponding to the Inferior A.S.N. arteries, with the Anterior Inferior vein, returning blood from the A-V node region. Of these 4 veins, only one originates on the lateral side of the S.V.S. ostium; the 3 remaining lie on the interatrial septum, near the corresponding angles: Anterior-Superior, Posterior-Superior and Anterior-Inferior.