AFAA Personal Trainer Certification Practice Exam

What is the structural composition of the sacrum?

1. A single vertebra at the base of the column

2. Composed of three fused vertebrae

3. Bone formed from five fused vertebrae

4. A bone formed from seven individual vertebrae

The correct answer is: Bone formed from five fused vertebrae

The sacrum is a triangular bone located at the base of the spine and is an essential part of the vertebral column. Its structural composition consists of five individual vertebrae that are fused together, creating a single, solid structure. This fusion is significant as it provides stability and strength to the pelvis and supports the weight of the upper body when standing and walking. The sacrum serves as an important connection point between the spine and the pelvis, facilitating the transfer of weight from the upper body to the lower limbs, which is crucial for posture and movement. The five fused vertebrae of the sacrum also help form the sacroiliac joints with the ilium bones of the pelvis, further contributing to the functionality of the hip and lower back regions. Understanding the correct composition of the sacrum is vital for personal trainers, as it impacts movement patterns and strength training exercises. Recognizing this anatomical feature aids in developing safe and effective exercise programs tailored to individual clients’ needs and biomechanics.