It's designed with 5, but they all fuse together into one by birth.
You still have 5 pairs of sacral nerves.
sacrum and coccyx
The sacrum and coccyx lie inferior to the lumbar vertebrae in the vertebral column.
The medical term for the five fused vertebrae above the tailbone is the sacrum.
The 33 vertebrae in the human spine are divided as follows: 7 cervical vertebrae, 12 thoracic vertebrae, 5 lumbar vertebrae, 5 sacral vertebrae (fused into the sacrum), and 4 coccygeal vertebrae (fused into the coccyx).
The vetebrae of the lower back are called lumbar vertebrae. Lower than that, the vertebrae are fused together in the sacrum, and the lowest part of the spine is the tailbone or coccyx.
sacrum and coccyx
Lumbar
the sacrum-bg
The sacrum and coccyx lie inferior to the lumbar vertebrae in the vertebral column.
The last 4 fused vertebrae in the spine are called the sacrum. The sacrum is a triangular bone located below the lumbar vertebrae and is formed by the fusion of five sacral vertebrae.
The medical term for the five fused vertebrae above the tailbone is the sacrum.
The human spine contains 33 bones, including the 24 vertebrae, 9 fused vertebrae in the sacrum and coccyx, and the skull base known as the sacrum.
Sacrum
sacral hiatus
24. A fetus has 33, but later the bones of the sacrum and coccyx fuse together.
No. There are no intervertebral discs in the Sacrum. The Sacrum is a fusion between 5 vertebrae and this the same with the Coccyx (fusion of 3). The final intervertebral disc is between L5 and the superior surface of the Sacrum.
The median sacral crest on the sacrum is a bony ridge formed by fusion of sacral vertebrae, indicating where the individual vertebrae once were. In contrast, the median sacral crest on lumbar vertebrae does not exist, as lumbar vertebrae do not fuse in the same way as sacral vertebrae.