Zoology - Neural Control and Coordination Question with Solution | TestHub

In the vertebral column, there are 7 free cervical vertebrae, 12 free thoracic vertebrae, 5 free lumbar vertebrae, 5 sacral vertebrae which are fused to form one bone called the sacrum and 4 coccygeal vertebrae which are fused to form one bone called the coccyx. Thus, there are 33 vertebrae and 26 bones in the vertebral column.

There are 8 pairs of cervical spinal nerves, 12 pairs of thoracic spinal nerves, 5 pairs of lumbar spinal nerves, 5 pairs of sacral spinal nerves and 1 pair of coccygeal spinal nerves. Thus, there are 31 pairs of the spinal nerve and all are mixed.