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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.
1 Right coronary artery supplies the right atrium and right ventricle with blood. 2  It branches into the posterior descending artery, which supplies the bottom portion of the left ventricle and back of the septum with blood.