Occurs btw three groups of arteries

Suprascapular- arises from the thyrococervical trunk, passes over the transverse scapular ligament, supplying the supraspinatus and infraspinatus

Dorsal Scapular- arises from the subclavian artery, accompanies the dorsal scapular nerve, supplies the rhomboids, levator scapulae and serratus anterior

Circumflex Scapular Arteries- arises from the subscapular artery, enters the triangular space

Posterior/Anterior circumflex- arises from the axillary artery and posteriorly with the axillary nerve from the quadrangular space along the surgical neck of humerus. anastomoses with profunda brachial artery

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Axillary Arterial Branches (group1)

Supreme Thoracic Artery- supplies the intercostal muscles 

Thoracoacromial Artery- has clavicular,acromial,deltoidal, pectoral branches. pierces through the clavipectoral fascia

Lateral Thoracic Artery- runs along lateral border of the pec minor. supplies the pec major/minor, serratus anterior, and the axillary lymph nodes. gives rise to lateral mammary branches

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Subscapular Artery- split into two branches

Thoracodorsal Artery- accompanies the thoracodorsal nerve and supplies the lat dorsi and lateral thoracic wall

Circumflex Scapular Artery- passes posteriorly through the triangular space

Anterior Humeral Circumflex Artery- anastomoses with the posterior circumflex artery

Posterior Humeral Circumflex Artery- runs posteriorly with the axillary nerve through the quadrangular space. anastomoses with the anterior circumflex and partially with the profunda brachii artery

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anastomoses in the scapular region arriving at the subscapular artery , provides the necessary compensation 

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Descends posteriorly with the radial nerve and gives off an ascending branch, which anastomesis with the descending branch of the posterior humeral circumflex artery.

Splits into 2 branches

Radial Collateral Artery- follows the radial nerve and ends at the lateral epicondyle anastomosing with the radial recurrent artery

Middle Collateral Artery- anastomosis with the interosseous recurrent artery

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Superior ulnar collateral artery- accompanies the ulnar nerve behind the intermuscular septum and the medial epicondyle. anastomesis with the posterior ulnar recurrent branch which connects to ulnar artery

Inferior Ulnar collateral artery- anastomoses with the anterior ulnar recurrent branch of the ulnar artery

*If the inferior recurrent branch is ligated, anastomoses will still reach the ulnar and radial artery

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Radial Recurrent Artery- provides the anastomesis from the radial collateral branch from the profunda brachii artery

Palmar Carpal Branch- joins the palmar carpal branch of the ulnar artery forming the palmar carpal arch

Superficial Palmar Branch- anastomeses with the superficial branch of ulnar artery completing the superficial palmar arterial arch

Dorsal Carpal Branch- joins the the dorsal carpal branch of hte ulnar artery and the dorsal terminal branch of the anterior interosseous artery to form dorsal carpal rete

Princeps Pollicis Artery- descends along the ulnar border of the first metacarpal. divides into 2 proper digital arteries for each side of the thumb

Radialis Indicis Artery- supplies the second metacarpal, arising from the deep palmar branch

Deep Palmar Arch- arises from the main termination of the radial artery and joins the ulnar artery branch, forms the common digital palmar arteries

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Anterior Ulnar recurrent artery- joins the inferior ulnar collateral artery

Posterior ulnar recurrent artery- joins the superior ulnar collateral artery

Common Interosseous Artery- arises from the lateral side and splits off into 2 branches

Anterior interosseous artery- descends with the anterior interosseous nerve to perforate the interosseous membrane anastomosing with the with the posterior interosseous artery and joins the dorsal carpal network

Posterior Interosseous Artery- Gives rise to the interosseous recurrent artery, which joins the middle collateral artery of the profunda brachii artery. descends behind the interosseous [image]membrane accompanies with posterior interosseous nerve. anastomoses with the the dorsal carpal branch of the anterior interosseous artery