cervical rib n.
A supernumerary rib articulating with a cervical vertebra, usually the seventh, but not reaching the sternum in front.
The cervical rib (fig. 41, 9) articulates with two little irregularities on the odontoid process.
The root of the neck should be examined to exclude pressure as the cause of the pain by a cervical rib, a tumour, or an aneurysm.
The cervical rib is often very similar to that type, and blended with the vertebra, as in Pterodactyles and Birds.