There are 12 thoracic vertebrae in the thoracic region. There are 5 lumbar vertebrae in the lumbar region. There are 5 sacral vertebrae, which are fused as one bone and known as the sacrum, in the ...

The lower (lumbar) spine consists of 5 vertebrae, L-1 through L-5, stacked on top of each other, held together by what are called facet joints. Just below L-5 is the sacrum and below that the coccyx ( ...