Axillary artery

Axillary artery
Axillary artery and its branches - anterior view of right upper limb and thorax. Upper and lower limits labeled.
The pectoralis minor muscle is used as a landmark for dividing the axillary artery into three parts.
Details
Source	subclavian artery
Branches	Superior thoracic Thoracoacromial Lateral thoracic Subscapular Anterior circumflex humeral Posterior circumflex humeral continues as brachial artery
Vein	axillary vein
Supplies	axilla
Identifiers
Latin	arteria axillaris
MeSH	A07.231.114.085
TA	A12.2.09.002
FMA	22654
Anatomical terminology []

In human anatomy, the axillary artery is a large blood vessel that conveys oxygenated blood to the lateral aspect of the thorax, the axilla (armpit) and the upper limb. Its origin is at the lateral margin of the first rib, before which it is called the subclavian artery.

After passing the lower margin of teres major it becomes the brachial artery.

The axillary artery is often referred to as having three parts, with these divisions based on its location relative to the Pectoralis minor muscle, which is superficial to the artery.

The axillary artery is accompanied by the axillary vein, which lies medial to the artery, along its length.

In the axilla, the axillary artery is surrounded by the brachial plexus. The second part of the axillary artery is the reference for the locational descriptions of the cords in the brachial plexus. For example, the posterior cord of the brachial plexus is so named because it lies posterior to the second part of the artery.

The axillary artery has several smaller branches. The branches can be remembered, in order, when traveling from the heart, with the mnemonics "Screw The Lawyers Save A Patient", "Summertime: The Lakers Schedule Another Parade", "Sixties Teens Love Sex And Pot", or "She Tastes Like Sweet Apple Pie." The origin of these branches is highly variable (e.g. the posterior and anterior circumflex arteries often have a common trunk). An arterial branch is named for its course, not its origin.

Continues as the brachial artery past the inferior border of the teres major.

The axillary artery may be safely clamped without endangering the arm, but only in a location proximal to the origin of the subscapular artery (and distal to the thyrocervical trunk of the subclavian artery). The anastomotic network surrounding the scapula provides an alternate path for collateral circulation to the arm from arteries including the dorsal scapular artery and suprascapular artery.