The spine can bend. But if you mean each individual vertebrae they cannot bend. They are made of hard bone. The elasticity of the spine is made possible by the inter-vertebral pads located between each vertebral unit. If the pads wear out the vertebral bones will rub against small nerves, blood vessels, spinal cord and possibly the marrow. So to clarify the vertebral column known as the spine can bend. Each vertebra made of hard bone does not bend and can be fractured if forced hard enough by a hard blow. I have added my favorite explanation with great diagrams for you. You can look in our reference library too but I like the pictures on this web article the best. Click on the related link below.
They "bend backwards" only if you look at them as a whole. They each do not but together they can make slight backward movements.
Almost all the joints between vertebrae are movable. The joints between the cervical vertebrae and lumber vertebrae have fairly good movement. Between thoracic vertebrae only you have less movement. But then they do move on each other.
Erector spinae
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Vertebrae are divided into sections: the atlas and axis account for the first cervical vertebrae, of which there are 7 in total; there are 12 thoracic vertebrae, 7 lumbar vertebrae, 1 sacrum (5 separate vertebrae in a baby), and 1 coccyx (4 separate vertebrae in a baby).
cervical vertebrae thoracic vertebrae. lumbar vertebrae
Dogs have a total of thirty vertebrae in their spines. They have seven cervical vertebrae, thirteen thoracic vertebrae, seven lumbar vertebrae and three sacral vertebrae.
Vertebrates have vertebrae .
Your spinal column, made up of 24 vertebrae plus the sacrum and the coccyx dorms a long, bony tube which protects the delicate nerves of your spinal cord.
The lumbar vertebrae, there are 5 lumbar vertebrae.
cervical vertebrae thoracic vertebrae. lumbar vertebrae
Vertebrae.