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: -As a result of this attachment, the axillary artery is more easily palpated in the concavity of the axilla when the arm is adducted (close to the midline of the body) and the suspensory ligaments are relaxed, than when it is abducted (away from the midline of the body) and the suspensory ligaments are taut.

Detailed explanation-3: -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-4: -The brachial artery is the extension of the axillary artery starting at the lower margin of the teres major muscle and is the major artery of the upper extremity. The brachial artery courses along the ventral surface of the arm and gives rise to multiple smaller branching arteries before reaching the cubital fossa.