What is the primary motion at Occiput-C1?

What is the primary motion at Occiput-C1?

• A. Flexion
• B. Extension
• C. Rotation
• D. Lateral Flexion

Answer: (D)

The main movement at the occiput-C1 joint is flexion and extension—nodding the head. The atlas sits on the occipital condyles in a way that favors sagittal-plane motion, with extension typically surpassing flexion. Rotational movement is handled mainly by the C1-C2 joint, which turns the head, while lateral flexion at this joint is limited and usually occurs as a secondary effect with some accompanying flexion/extension. So the primary motion here is flexion-extension, not lateral bending.

The main movement at the occiput-C1 joint is flexion and extension—nodding the head. The atlas sits on the occipital condyles in a way that favors sagittal-plane motion, with extension typically surpassing flexion. Rotational movement is handled mainly by the C1-C2 joint, which turns the head, while lateral flexion at this joint is limited and usually occurs as a secondary effect with some accompanying flexion/extension. So the primary motion here is flexion-extension, not lateral bending.