The Axillary Artery is a large blood vessel that conveys oxygenated blood to the lateral aspect of the thorax, the axilla (armpit) and the upper limb.⁣

The axillary artery is customarily divided into three parts:⁣

1st part of axillary artery: It lies between the lateral border of the first rib and the medial border of the pectoralis minor muscle. It gives one branch named as the “highest thoracic artery”⁣

2nd part of the axillary artery: It lies under the pectoralis minor muscle. It gives two branches; the lateral thoracic artery and the thoracoacromial artery. The lateral thoracic artery continues downward along the lateral border of pectoralis minor.⁣

3rd part of axillary artery: It lies between the lateral border of pectoralis minor and the lower border of the teres major muscle. It gives three branches; the subscapular artery, the anterior circumflex humeral artery and the posterior circumflex humeral artery.⁣

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