Let's suppose we say that the backbone is like a train which has different compartments linked via mechanical links. How many different compartments will be there in such a train _____?
33
The above-hypothesized train will have a total of 33 compartments. The backbone consists of 33 vertebrae, 24 of which are separated by intervertebral discs and remaining 9 are fused as the sacrum (5) and coccyx (4).