Axial Skeleton - Ribs Function – Protection – Respiration Phylogeny - new Endochondral.
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Transcript of Axial Skeleton - Ribs Function – Protection – Respiration Phylogeny - new Endochondral.
Ribs
Monocipital (snakes & monotremes)Bicipital
– Dorsal head = tuberculum– Ventral head = capitulum
Ribs - Fish
Some have no ribsSome have dorsal ribs only (sharks)Some have ventral ribsSome have dorsal & ventral ribs
Ribs - Reptiles
Typically short in neck and long in trunkTurtles – fused to carapaceSnakes – long and curvedCrocodiles – Gastralia are NOT ribs
Sternum
Needed for stronger & more mobile forelimbs
Tetrapod feature onlyFunction – protection, strengthens body
wall, attaches muscles, rib attachmentEndochondral bone
Sternum - amphibians
Frogs & toads – ossified, but poorUrodeles – flimsy if presentCaecilians - none
Sternum - reptiles
Lizards – largeCrocodiles – large cartilaginous plateSnakes – noneTurtles – none needed