and Posterior Humeral Circumflex Arteries
The smaller Anterior Humeral Circumflex and the larger Posterior Humeral Circumflex Arteries arise from the third part of the axillary. The anterior humeral circumflex passes beneath the tendon of the long head of the biceps brachii supplying the shoulder joint and surrounding muscles. The posterior humeral circumflex passes in the interval between the teres major and subscapularis muscles (quadrangular space) accompanied by the axillary nerve. The axillary nerve and posterior humeral circumflex artery wrap around the surgical neck of the humerus, supplying the shoulder joint and surrounding muscles. The posterior humeral circumflex artery is frequently the source of the profunda brachii artery and vice versa.