Cervical Rib Syndrome. With a Case Record

Cervical ribs in man are anomalous structures Lather than examples of evolution or reversion. rhe embryological formation of supernumerary ribs is attributed to a conflict between forming plexuses and ribs. In high forms the limb buds cover several vertebral segments, the nerves from which grow into the buds. The nerves have to follow an oblique course before entering the ouds due to a different pace of growth between the column and the buds. The obliquely running nerves impede the growth of the ribs to the extent that they merely form vertebral processes. Anatomical classification.?Cervical ribs are divided into four groups according to the extent ?f growth. *? Slight degree?the rib reaching just beyond the transverse process. 2. More advanced?the rib touches the first rib.