Falx cerebelli

Attachments

Superiorly, it (with its upwardly directed base) attaches at the midline to the posterior portion of the inferior surface of the tentorium cerebelli.^[3]

Posteriorly, it attaches to the internal occipital crest; the inferior-most extremity of its posterior attachment frequently divides into two small folds that terminate at either side of the foramen magnum.^[3]

Anatomical relations

The occipital sinus is contained within the posterior extremity of the falx cerebelli where it attaches to the internal occipital crest.^[3]

Anatomical variation

In its lower portion the falx cerebelli diminishes very rapidly in height and as it descends, it can divide into two smaller folds or diverging limbs,^[5] which are lost on the sides of the foramen magnum. Other variations such as duplication,^[6] triplication,^[7] absence,^[8] and fenestration are much less common. As dural venous sinuses are concurrent with the development of dural folds, duplication of the falx cerebelli is usually associated with duplicated occipital sinus.^[9] Knowledge of these variations is important in preventing iatrogenic injuries in this region.^{[citation needed]}