Posterior atlantoaxial ligament

Posterior Atlantoaxial Ligament

Posterior atlantoaxial ligament (shown in red) in relation to the atlas and axis vertebrae.

The Posterior Atlantoaxial Ligament is a ligamentous structure in the human body that plays a crucial role in the stability of the atlantoaxial joint. This ligament is part of the craniovertebral junction, which is a complex set of joints that connect the skull and the upper part of the vertebral column.

Anatomy

The Posterior Atlantoaxial Ligament extends from the posterior arch of the atlas to the posterior aspect of the axis. It is a thin, broad band that is often doubled and is more narrow in the middle than at either end. It serves to limit flexion and rotation of the head and neck.

Function

The primary function of the Posterior Atlantoaxial Ligament is to provide stability to the atlantoaxial joint. It restricts excessive anterior translation of the atlas on the axis and prevents excessive rotation of the cervical spine.

Clinical Significance

Damage or injury to the Posterior Atlantoaxial Ligament can lead to instability of the atlantoaxial joint, which can result in serious neurological complications due to the proximity of the spinal cord. Conditions such as rheumatoid arthritis can also affect the integrity of this ligament, leading to atlantoaxial instability.

See Also

• Anterior atlantoaxial ligament
• Transverse ligament of atlas
• Alar ligament