Please note that the content of this book primarily consists of
articles available from Wikipedia or other free sources online. A
cervical rib is a supernumerary (or extra) rib which arises from
the seventh cervical vertebra. It is a congenital abnormality
located above the normal first rib. A cervical rib is present in
only about 1 in 500 (0.2%) of people; in even rarer cases, an
individual may have two cervical ribs. Cervical ribs are sometimes
known as "neck ribs." The presence of a cervical rib can cause a
form of thoracic outlet syndrome due to compression of the lower
trunk of the brachial plexus or subclavian artery. These structures
are entrapped between the cervical rib and scalenus muscle.
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