MICROANATOMY

Detailed explanation-1: -The axillary artery commences from the subclavian artery at the outer border of the first rib and terminates when it becomes the brachial artery at the outer border of the teres major muscle.

Detailed explanation-2: -The subclavian arteries course laterally between the anterior and middle scalene muscles. The distal limit of the subclavian artery is the lateral border of the first rib, where it becomes the axillary artery.

Detailed explanation-3: -Beyond the first rib where it passes underneath the clavicle, the subclavian artery becomes the axillary artery and passes underneath the pectoralis minor muscle.

Detailed explanation-4: -The axillary artery gives out three branches at the portion, the subscapular artery, the lateral humeral circumflex artery, and the medial circumflex artery.

Detailed explanation-5: -The axillary artery is a direct continuation of the subclavian artery. It extends from the lateral border of the first rib to the inferior border of the teres major muscle (see Figures 3 and 4).