In the spine of the fish there are 2 sections – the trunk and the caudal, all the vertebrae are connected semi-movable, which gives the body flexibility. With the emergence of animals on land, the number of spine sections increases: in amphibians – cervical, thoracic, sacral and caudal (1 cervical vertebra, no ribs, 1 sacral and caudal urostyle),
reptiles – lizards – have several cervical vertebrae, have ribs, and a lumbar region has appeared. The skeleton of birds has changed in connection with the flight – all parts of the spine, except for the cervical, are fused.
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