Illustrated Encyclopedia of Human Anatomic Variation: Opus II: Cardiovascular System: Arteries: Head, Neck, and Thorax
Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed
This artery is inconstant (absent in 30-40%) of individuals and may arise from other parts of the subclavian.
The usual branches are: superior (supreme) intercostal and the deep cervical.
It is found on the right side in 75% of cases and occurs on the left in only 30% of humans.
It is absent in 8-10% of cases, and thus its main branches may arise independently, most frequently from the second part of the subclavian.
The costocervical trunk may give rise to a lateral internal thoracic artery, which lies about midway between the sternum and vertebral bodies or the mid-axillary line.
The dorsal scapular artery may be an additional branch when it arises from the third part of the subclavian (34% of individuals).
The supreme intercostal, arteria supracostalis, and deep cervical artery may also arise from the costocervical trunk.
Image 94, Image 257, Image 320
See Image 257
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