Illustrated Encyclopedia of Human Anatomic Variation: Opus II: Cardiovascular System: Arteries: Upper Limb
Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed
Occasionally, it gives rise to the radial artery or, more rarely, to the ulnar artery. Still more rarely, it gives rise to the interosseous artery or a vas aberrans.
It may give rise to a common trunk from which may arise the subscapular, anterior and posterior circumflex humeral, profunda brachii, and ulnar collateral arteries. The branches of the brachial plexus may surround this common trunk, but not the main brachial artery.
In some cases, the brachial artery appears to be an enlarged "vas aberrans," and the common trunk to the brachial artery, the lower portion of which has been obliterated. A vas aberrans, according to Quain, is a long, unusually slender vessel that originates either from the axillary or the brachial and unites with forearm arteries or their branches. The vas aberrans may extend into the hand to join the superficial palmar arch. In eight of nine cases, the aberrant vessel joined the radial artery; hence it rarely joins the ulnar.
The axillary artery may be represented by two parallel vessels that arise from the first part of the subclavian and continue distally as the ulnar and radial arteries.(Calori)
The first part of the axillary may also provide an accessory thoracoacromial artery. The third part of the axillary artery is occasionally covered by a muscular slip (an axillary arch muscle) derived from the upper part of the tendon of latissimus dorsi; this muscular slip is "always" present in early fetal life, but it usually atrophies later. Axillary arch muscles may persist and may be clinically important. In an article by Alexander Ramsay, Account of unusual conformations of some muscles and vessels, 1813 (see reference list for full citation) the author remarks, " that in 1795, he discovered a transverse muscle of the axilla, which may account for the liability of some subjects to swelling of the axillary glands (nodes) on occasions of violent exertion. This body is composed of an oblong muscle, stretched from the pectoral muscle to the latissimus dorsi and teres major, which in its violent contractions, must prove inconvenient to the axillary arteries, veins, and nerves, which lie beneath this muscle. It was not known in Edinburgh or London, when I demonstrated it, and it is now detected in one of thirty subjects, when dissectors are attentive." The muscle is now known as an axillary arch muscle. It has been well studied by Langer (and others) whose name is often given with it, e.g. Langer's muscle. A more suitable name would be, perhaps, Ramsay's muscle. The Langer citation can be found in Part 1, Muscular System of the present series under Axillary Arch Muscle.
Any of the following branches that normally arise from the subclavian artery may also arise instead, from the axillary artery, either from a common trunk or in groups: the inferior thyroid, ascending cervical, superficial cervical, deep cervical, internal thoracic, transverse cervical, suprascapular or the anterior and posterior circumflex humerale arteries from a common trunk. A trunk from the axillary has been reported giving rise to the anterior and posterior circumflex humeral, the subscapular, the superior profunda, and the inferior profunda arteries (Walsham).
Unusual branches of the axillary include a glandular artery to lymph nodes and skin of the axilla (so called alar thoracic artery) and an accessory lateral thoracic artery.
Heuston reported on three interesting axillary arteries as follows. An aberrant artery, which arose from the axillary, above the origin of the subscapular branch, passed in the arm to the inner (medial) side of the brachial artery, to unite with the radial about two inches below its commencement. In this case the brachial artery bifurcated about one inch (2.54 cm) above its normal position. In a second case, the unusual artery also arose from the axillary, opposite the upper border of teres major muscle, and passing between the heads of the median nerve, proceeded down the outer (lateral) side of the brachial artery, to unite with the radial recurrent, which was large in size in the antecubital fossa. In the third case, the suprascapular artery, arising from the axillary opposite the second rib, passed upwards beneath the clavicle through the cords of the brachial plexus, and having given a branch to the subscapularis muscle, passed beneath the transverse ligament (of the scapula) with the suprascapular nerve, to be distributed as usual.
Image 57, Image 326A, Image 326B, Image 326C, Image 326D, Image 329
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Variations in Branches of Axillary Artery
The following variations have been recorded in the branches of the axillary artery.
The first part may give rise to the dorsal (posterior) scapular artery (0.5% of individuals, Poynter). Pellegrini found the first branch to be one to serratus anterior (20% of individuals) and Poynter found this same vessel in 42% of 200 cases.
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