| primitive costal arches | Arch's formed in the thoracic region of the vertebral column in the embryo from the costal processes or costal elements which give rise to the ribs. (05 Mar 2000) |
|---|---|
| fallen arches | A breaking down of the arch's of the foot, either longitudinal, transverse, or both; the resulting deformity is flat or splay foot, or both. (05 Mar 2000) |