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Superior thoracic First part (as only branch) Thoraco-acromial Second part (first branch) Axillary artery Lateral thoracic Circumflex humeral (anterior and posterior) Subscapular Circumflex scapular Thoracodorsal Second part (second branch) Third part (sometimes via a common trunk) Third part (large...

Superior thoracic First part (as only branch) Thoraco-acromial Second part (first branch) Axillary artery Lateral thoracic Circumflex humeral (anterior and posterior) Subscapular Circumflex scapular Thoracodorsal Second part (second branch) Third part (sometimes via a common trunk) Third part (largest branch of any part) Subscapular artery Profunda brachii (deep artery of arm) Near its origin Superior ulnar collateral Near middle of arm Brachial artery Inferior ulnar collateral Superior to medial epicondyle of humerus Runs anteromedially along superior border of pectoralis minor; then passes between it and pectoralis major to thoracic wall; helps supply 1st and 2nd intercostal spaces and superior part of serratus anterior Curls around superomedial border of pectoralis minor; pierces costo- coracoid membrane (clavipectoral fascia); divides into four branches: pectoral, deltoid, acromial, and clavicular Descends along axillary border of pectoralis minor; follows it onto thoracic wall, supplying lateral aspect of breast Encircle surgical neck of humerus, anastomosing with each other laterally; larger posterior branch traverses quadrangular space Descends from level of inferior border of subscapularis along lateral border of scapula, dividing within 2-3 cm into terminal branches, the circumflex scapular and thoracodorsal arteries Curves around lateral border of scapula to enter infraspinous fossa, anastomosing with suprascapular artery Continues course of subscapular artery, descending with thoracodor- sal nerve to enter apex of latissimus dorsi Accompanies radial nerve along radial groove of humerus, supplying posterior compartment of arm and participating in periarticular arte- rial anastomosis around elbow joint Accompanies ulnar nerve to posterior aspect of elbow; anastomoses with posterior ulnar recurrent artery Passes anterior to medial epicondyle of humerus to anastomose with anterior ulnar collateral artery