The Lateral Thoracic artery originates from which artery?

The Lateral Thoracic artery originates from which artery?

• A. Axillary artery
• B. Subclavian artery
• C. Brachial artery
• D. Aorta

Answer: (A)

The lateral thoracic artery most often arises from the axillary artery, typically from its second part as it courses along the lateral chest wall. It travels near the lateral edge of the pectoralis minor and supplies the serratus anterior, pectoralis major, and nearby breast tissue. This origin is why axillary artery is the correct choice; the other vessels listed are not the usual source of this artery—subclavian, brachial, and the aorta are upstream or downstream structures and do not give rise to the lateral thoracic artery in the standard anatomy. (Note: variations exist where the lateral thoracic artery can originate from the thoracoacromial trunk, which itself is a branch of the axillary artery, but the classic origin is the axillary.)

The lateral thoracic artery most often arises from the axillary artery, typically from its second part as it courses along the lateral chest wall. It travels near the lateral edge of the pectoralis minor and supplies the serratus anterior, pectoralis major, and nearby breast tissue. This origin is why axillary artery is the correct choice; the other vessels listed are not the usual source of this artery—subclavian, brachial, and the aorta are upstream or downstream structures and do not give rise to the lateral thoracic artery in the standard anatomy. (Note: variations exist where the lateral thoracic artery can originate from the thoracoacromial trunk, which itself is a branch of the axillary artery, but the classic origin is the axillary.)