What is the primary function of the alar ligament?

The primary function of the alar ligament is to attach the first and second cervical vertebrae (C1 and C2) to the occipital bone at the base of the skull. This ligament plays a crucial role in stabilizing the atlanto-occipital joint, which facilitates head movements and enables the proper functioning of the cervical spine.

The alar ligament serves as a critical connector that helps prevent excessive rotation and lateral bending of the head, ensuring that the skull and spine maintain their proper alignment during movement. Its structural integrity is essential for maintaining cervical stability and protecting the spinal cord and brain from injury during various physical activities and impacts.

By linking C1 (atlas) and C2 (axis) to the occiput, the alar ligament contributes significantly to the overall stability of the craniovertebral junction, allowing for a range of movement while also providing resistance against potentially harmful forces.