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Diagram of branches of axillary artery Acromial Br C rtery mial a o r c a o c Thora t 1st Par Deltoid Br 2n d Anterior circumflex humeral artery Br lar u c i lav d 3r rt Pa Superior thoracic artery Pectoral Br Pectoralis minor Subscapular artery Lateral thoracic artery Posterior circumflex humeral artery Circumflex scapular artery Label No Label The From 1st artery (a)superior begins thoracic at the outer – it runs border in along of the first rib intercostal and ends space. at prothe Fromaxillary 2nd 3rdpart part .(a)(a)subscapular The thoracoacromial runs down artery with the – athe stout longfirst subscapular short trunk, nerve, which just where it continues the brachial artery. it lower jects forward ofover terres the major, innerfold. boarder of pectoralis minor and scapula divides into four withinborder the posterior axillary Near the lowerasangle of the divides branches. (i)side clavicular, up over subclavius ; (ii) pectoral largesurface and runs into two, one goes toruns the side of the chest, the other to theisdeep of The axillary artery across thewith superior aspect ofanterior the axilla is marked by the latissimus down between with the runs the twolong pectorals subscapular the nerve. external Near its origin thoracic itand gives nerve, off a large and asupplies line drawn from the middle of the clavicle tocomes a point half-way between the two branch, the these circumflex muscles; scapular (iii) acromial, artery, usually which passes off back a common through trunk the “trianguwith the condyles of to the humerus, when arm is raised tothe a right angle. lar space” deltoid, and runs the back dorsum beneath of the thescapula. deltoid toward (b) The anterior acromion; circumflex and (iv)humeral deltoid runs down beside the cephalic vein,passes in a groove between deltoid artery which is a small artery that out across the front ofand the pectoralis humerus, It is divided into three by the crossing of thethe pectoralis stage is major, and ends inupthese muscles. sending a branch to parts the shoulder joint through bicipitalminor. groove1st , and ends medial, 2ndthoracic stage 3rdcover stagehumeral is the lateral to border theismuscle. in the (b) lateral deltoid. (c) is The –posterior, runs posterior downand under circumflex of outer artery a large of theartery pectoralis that runs back minor to the with wall theofcircumflex the thoraxnerve (and through the mammary the “quadrilateral gland in a female). space” supplying the surrounding structures, and breaking up, it ends at the deltoid.