Specimens were examined retrospectively by a pathologist. The rectum was defined as the area located between the lower border of the second sacral vertebra and the upper border of the anal canal.

L5-S1 is the exact spot where the lumbar spine ends and the sacral spine begins. The lumbosacral joint connects these bones.

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 sacral region. There are 3 to 5 coccygeal vertebrae, which ...