What is the function of the filum terminale?

The filum terminale is a delicate, fibrous structure that descends from the conus medullaris of the spinal cord and is composed primarily of pia mater. Its primary function is to provide an anchor for the spinal cord within the vertebral canal by attaching to the coccyx. This anchoring helps stabilize the spinal cord against movements that could cause strain or injury. As an extension of the pia mater, the filum terminale also reflects the continuity of the meninges, which envelop the spinal cord and provide essential protection and support.

This particular structure is vital for maintaining the position of the spinal cord and is an important part of the spinal cord's overall anatomical organization. The filum terminale plays a crucial role in preventing displacement of the spinal cord that could result from body movements or external mechanical pressures.