Figure 1
From: An anatomical and radiological study of the tectorial membrane and its clinical implications
Sagittal view of the craniovertebral junction. (a) The cruciate ligament–tectorial membrane (TM)–dura mater complex between the clivus and the body of the axis. c clivus, d dens. (b) Sagittal T2-weighted magnetic resonance image shows thin normal delineated TM with normal integrity from clivus to dens (arrowheads). (c) Sagittal T2-weighted magnetic resonance image shows a discontinuous TM (asterisks) surrounded by fluid signal intensity. In a patient with TM tear, the TM shows attachment to the superior clivus. The TM tear is visualized at the level of apex of the dens (arrow). At the level of the body of the axis, the TM shows irregular fraying, and the continued posterior longitudinal ligament is retracted with coarse attachment to the dens.
