INBDE (Integrated National Board Dental Examination) Practice Exam

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Once the subclavian artery crosses under the clavicle and over the 1st rib, it is renamed as?

Radial artery
Axillary artery
Brachial artery
Ulnar artery

The correct answer is: Axillary artery

After the subclavian artery crosses under the clavicle and over the first rib, it changes its name to the axillary artery. This artery then continues down the arm, giving off branches to the shoulder muscles and axillary lymph nodes. The radial, brachial, and ulnar arteries all branch off of the axillary artery, but they do not serve as a continuation of it. The brachial artery, for example, branches off of the axillary artery in the upper arm, serving as the main arterial supply for the arm. The radial and ulnar arteries continue branching off from the brachial artery to supply the forearm and hand. Therefore, while these arteries are important for blood supply in the arm, they are not the continuation of the axillary artery. This makes option B, the axillary artery, the correct answer.