How many vertebrae are in the spine?
The human spine has 33 vertebrae at birth. In adults, several fuse, leaving 24 separate vertebrae plus the fused sacrum and tailbone, often counted as 26 bones.
The spine is divided into regions. There are 7 cervical vertebrae in the neck, 12 thoracic vertebrae in the upper back, which connect to the ribs, and 5 lumbar vertebrae in the lower back, which are the largest and carry the most weight. Below them, 5 vertebrae fuse to form the sacrum, and 3 to 5 small ones form the coccyx, or tailbone.
Between most vertebrae are discs made of tough cartilage with a gel-like center. They act as shock absorbers and allow the spine to bend and twist. A slipped or herniated disc happens when the inner gel pushes out and presses on nerves, which can cause back pain or leg pain.
Natural curves
A healthy spine has an S-shaped curve when seen from the side. These curves help balance the head and body, absorb shock when walking and running, and distribute weight. Good posture and regular exercise help keep the spine healthy.
Did You Know?
Almost all mammals, including giraffes, have seven neck vertebrae. A giraffe's are just much longer.
This answer is general information, not medical advice. For a personal health question, talk to a doctor.