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 are fused as one bone and known as the coccyx ...

Doctors may call it coccydynia. Pain in the tailbone or coccyx, the lowest part of the spine, may radiate to the hips, thighs, or rectum. This pain can make sitting difficult, exercise painful ...

Blood sample collection in lizards is an important technique. This column describes techniques for sample collection from the ventral coccygeal vein and the ventral abdominal vein. The ventral ...