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The circulatory system is a complicated network of veins and arteries that run through every part of the body. Oxygenated blood travels through the arteries, providing cells with the oxygen and nutrients they need to function properly. The brachial artery is the main blood supply to the arm, forearm, hands, and fingers. Because it is close to the surface of the arm, it's easy to locate and doctors use it in a variety of medical assessments and procedures.

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1. Origin: the Axillary Artery

The axillary artery runs through the axilla or armpit and becomes the brachial artery, which starts at the teres major muscle on the underside of the upper arm between the elbow and shoulder and ends at the cubital fossa on the inner elbow. From there, it divides into the ulnar artery and radial artery, which run along the two bones of the forearm.

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