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
In Poynter's series it was the second branch in 47% of individuals studied.
In some cases the arteries that make up the trunk arise separately, and in other cases it may have four branches; supreme (superior) thoracic, thoracic branch of the thoracoacromial, accessory pectoral branches, and lateral thoracic.
The thoracoacromial artery may send a branch to pectoralis minor (8%)
This artery may have a common origin with some other artery in 24% of individuals.
The first part of the axillary artery may, in rare cases, give rise to the subscapular artery or supply a branch to the subscapular muscle.
References
See references listed under Axillary (artery)and Supreme (Superior) thoracic.
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