AAAI ISMA Primary Aerobic And Group Fitness Instructor Certification Practice Test

How many fused vertebrae make up the sacrum?

Three Four Five Six

Correct Answer:

Five

Explanation:

The sacrum is formed from multiple spinal segments that fuse to create a single, solid bone. In an adult, five sacral vertebrae come together and fuse during adolescence, producing one triangular bone that anchors the pelvis and supports the spine. Because those five original segments fuse into the sacrum, the typical count is five. Three or four would suggest fewer original segments, while six would exceed the normal number of sacral precursors. So the sacrum is made up of five fused vertebrae.

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