Longitudinal Ligaments of the Spine

Introduction

The anterior longitudinal ligament (ALL) and the posterior longitudinal ligament (PLL) on the cervical spine

Illustration of a lateral view of the upper cervical spine depicts the three-column model.

• Joints of the vertebral bodies supported and stabilized by ligaments
• Serve to resist hyperextension of the vertebral column
• Includes the anterior and posterior longitudinal ligament

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Anterior Longitudinal Ligament

Description

• Also called ALL
• Covers the anterolateral surface of the vertebral bodies and intervertebral discs
• Attaches superiorly to the occipital bone, foramen magnum, anterior tubercle of C1
• Extends distally to the anterior surface of the sacrum

Function

• Supports the joints between the vertebral bodies
• Prevents hyperextension of the spine

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Posterior Longitudinal Ligament

Description

• Also called PLL
• Runs along the posterior surface of the vertebral bodies within the vertebral canal
• Originates along vertebral body of C2, tectorial membrane of the skull
• Inserts distally on the sacrum
• Much narrower than the anterior longitudinal ligament

Function

• Resists hyperflexion of the vertebral column
• Helps prevent posterior herniation of the nucleus pulposus

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Clinical Significance

• Needs to be updated

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See Also

• Back Pain Main
• Physical Exam Back
• Back Anatomy Main

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