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Clinical Anatomy For Dummies. The tissues of the pectoral girdle need oxygen. So a complex series of arteries supplies blood flow through the shoulder, upper arm and chest area. And because the axilla includes several important lymph nodes, that lymph has to flow.
The left coronary arteries supply: 1  Circumflex artery - supplies blood to the left atrium, side and back of the left ventricle. 2  Left Anterior Descending artery (LAD) - supplies the front and bottom of the left ventricle and the front of the septum.