In mammals, one generally thinks of ribs occurring only in the chest. However, fused-on remnants of ribs can be traced in development in neck vertebrae (cervical ribs) and sacral vertebrae.
In reptiles, ribs sometimes occur in all vertebrae from the neck to the sacrum.
Fish can have up to four ribs on each vertebra and this can easily be seen in the herring, although not all fish have this many.
Humans (both male and female) have 24 ribs (12 sets). This was noted by the Flemish anatomist Vesalius in 1543 setting off a wave of controversy.
Ребро | Ribben | Rippe | Ripo | Côte (anatomie) | Aisean | Šonkaulis | Rib (anatomie) | 肋骨 | Ribben | Żebra (anatomia) | Costela | Kylkiluu | Revben | Kaburga | 肋骨