Atlas and text-book of topographic and applied anatomy . l. The subscapular artery divides into two chiefbranches, the dorsalis scapulae and the thoracicodorsalis [the continuation of the subscapular].The dorsalis scapula: runs over the external border of the scapula to the dorsal surface of this bone,supplies the surrounding muscles, and anastomoses freely with the suprascapular branch of thesubclavian. This is the main path for the collateral circulation when the blood-current in theaxillary artery is interfered with or when this vessel is ligated. The thoracicodorsalis is the largestvessel
Atlas and text-book of topographic and applied anatomy . l. The subscapular artery divides into two chiefbranches, the dorsalis scapulae and the thoracicodorsalis [the continuation of the subscapular].The dorsalis scapula: runs over the external border of the scapula to the dorsal surface of this bone,supplies the surrounding muscles, and anastomoses freely with the suprascapular branch of thesubclavian. This is the main path for the collateral circulation when the blood-current in theaxillary artery is interfered with or when this vessel is ligated. The thoracicodorsalis is the largestvessel of the lateral thoracic wall (see page 96). It runs down the axillary border of the scapula,under cover of the edge of the latissimus dorsi, and particularly supplies the teres major, thelatissimus dorsi, and the serratus magnus muscles. Fig, 29. M. pectorali; glands Long thoracic Posterior circumflex artery Circumflex nerveMedian nerveMusculocutaneous nerve Ulnar nerve Axillary artery Musculospiral nerve Brachial plexus Axillary vein Internal cutaneoi. THE SHOULDER. 75 3. The long thoracic, an inconstant branch, which arises above the subscapular (see page95) and is situated in front of the thoracic dorsalis. 4. The anterior circumflex, a small branch which runs outward over the anterior surface ofthe neck of the humerus. 5. The posterior circumflex, a large branch which arises beside the preceding one, passesthrough the quadrangular space (see page 76) close to the bone to run posteriorly with the cir-cumflex nerve and, like it, to particularly supply the deltoid muscle. As the vessel is closelyrelated to the neck of the humerus, it must be carefully treated in resection of the the operation is strictly subperiosteal, the elevator being always directed toward the bone, thevessel will escape injury. The axillary vein, like the subclavian, is situated in front and to the inner side of the artery;it consequently covers the artery to a varying extent, dependent
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