Denticulate ligament

Denticulate Ligament

The denticulate ligament is an important anatomical structure in the human body, specifically within the nervous system. It is a specialized extension of the pia mater, one of the three meninges that cover the brain and spinal cord. The denticulate ligament is named for its tooth-like appearance, with the term "denticulate" derived from the Latin word for "toothed."

Structure

The denticulate ligament is a thin, delicate band that extends from the lateral sides of the spinal cord. It is composed of 21 pairs of triangular-shaped extensions, which are anchored to the inner surface of the dura mater. These extensions are evenly spaced along the length of the spinal cord, from the level of the foramen magnum to the second sacral vertebra.

Function

The primary function of the denticulate ligament is to stabilize the spinal cord within the vertebral column. By anchoring the spinal cord to the dura mater, the ligament prevents lateral movement of the cord. This is particularly important during movements of the neck and spine, as it helps to protect the spinal cord from injury.

Clinical Significance

Damage or abnormalities of the denticulate ligament can have significant clinical implications. For example, in cases of Chiari malformation, a neurological disorder where part of the brain descends into the spinal canal, the denticulate ligament can become stretched or damaged. This can contribute to symptoms such as pain, weakness, and numbness. Surgical procedures involving the spinal cord, such as laminectomy, may also involve the denticulate ligament.

See Also

• Meninges
• Spinal cord
• Chiari malformation