Question

Which movements does the sacrum do bilaterally?

A. Flexion and extension
B. Rotation and side-bending
C. Side-bending and flexion
D. Extension and rotation

Answer 1

The sacrum performs flexion and extension bilaterally, involving the sagittal plane with anterior or posterior movements. Lateral flexion is not bilateral for the sacrum. Therefore, the correct answer is A. Flexion and extension.

Step-by-step explanation:

The movements that the sacrum performs bilaterally are flexion and extension. These movements occur within the sagittal plane, and involve the anterior or posterior movements of the body. Specifically, for the vertebral column, which includes the sacrum:

• Flexion (anterior flexion) is described as an anterior (forward) bending, such as bending forward at the waist.
• Extension refers to a posterior-directed motion, which would be straightening up from a flexed position or bending backward.

Lateral flexion occurs when the vertebral column bends toward the right or left side. However, this is not a bilateral movement of the sacrum.

The correct answer to the student's question is: A. Flexion and extension.