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falx cerebelli
The falx cerebelli is a small sickle shaped fold of dura mater, projecting forwards into the posterior cerebellar notch as well as projecting into the vallecula of the cerebellum between the two cerebellar hemispheres.〔http://babel.hathitrust.org/cgi/pt?q1=falx%20cerebelli;id=ien.35558004773517;seq=329;start=1;size=25;page=search;num=189〕
The name comes from the Latin word ''falx'' meaning "curved blade or scythe" and ''cerebellum'' meaning "brain".〔Sihler, Andrew L. (1995). New Comparative Grammar of Greek and Latin. Oxford University Press. ISBN 978-0-19-508345-3. Retrieved 12 March 2013.〕 Its base is attached, above, to the under and back part of the tentorium cerebelli; its posterior margin, to the lower division of the vertical crest on the inner surface of the occipital bone. The falx cerebelli generally lies somewhere between 2.8 and 4.5 cm in length and is approximately 1–2 mm thick.〔Shoja MM, Tubbs RS, Khaki AA, Shokouhi G. A rare variation of the posterior cranial fossa: duplicated falx cerebelli, occipital venous sinus, and internal occipital crest. Folia Morphol (Warsz) 2006;65(2):171–173.〕
==Variations in Morphology==
In its lower portion the falx cerebelli diminishes very rapidly in height and as it descends, it sometimes to frequently divides into two smaller ''folds'' or ''diverging limbs'',〔http://babel.hathitrust.org/cgi/pt?q1=falx%20cerebelli;id=ien.35558004773517;seq=329;start=1;size=25;page=search;num=189〕 which are lost on the sides of the foramen magnum. Other variations such as duplication,〔Shoja MM, Tubbs RS, Khaki AA, Shokouhi G. A rare variation of the posterior cranial fossa: duplicated falx cerebelli, occipital venous sinus, and internal occipital crest. Folia Morphol (Warsz) 2006;65(2):171–173.〕 triplication,〔Shoja MM, Tubbs RS, Loukas M, Shokouhi G, Oakes WJ. A complex dural-venous variation in the posterior cranial fossa: a triplicate falx cerebelli and an aberrant venous sinus. Folia Morphol (Warsz) 2007;66(2):148–51.〕 absence,〔Tubbs Rs, Dockery SE, Salter G, Elton S, Blount JP, Grabb PA, Oakes WJ. Absence of the falx cerebelli in a Chiari II malformation. Clin Anat. 2002;15(3):193–195.〕 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.〔Shoja MM, Tubbs RS, Shokouhi GH, Ashrafian A, Oakes WJ. Abstract presented at the 23rd Annual Meeting of the American Association of Clinical Anatomists. Milwaukee, Wisconsin: 2006. A triple dural-venous variation in the posterior cranial fossa: A duplicated plus accessory falx cerebelli and an aberrant venous sinus.〕 Knowledge of these variations is important in preventing iatrogenic injuries in this region.
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