Good news if you already consume tuna on a regular basis, itâs high in niacin compared to many other foods. Itâs also a good source of omega-3s as well as protein. There are concerns about the mercury content, so you may not want to rely on tuna for your daily niacin consumption, but itâs nice to have once in awhile. Serving Size (100 grams), Niacin (5.8milligrams), 184 calories.
At the end of the spinal column is the coccyx or tailbone. Most people have 33 vertebrae in total, although there may be 32 or 34. Variations are usually found in the lumbar or sacral regions.
The sacral region (sacrum) is at the bottom of the spine and lies between the fifth segment of the lumbar spine (L5) and the coccyx (tailbone).1  See: Lumbar Spine Anatomy and Pain.ailbone Pain Video. Unlike the individual vertebrae in other regions of the spine, the vertebrae in the sacral region as well as the coccyx are fused. The coccyx (also called the tailbone) is located at the base of the spine and is composed of four fused vertebrae.