Summary

This chapter discusses anatomical variations of human meninges, including dura mater, arachnoid mater, and pia mater. Anatomical variations in the main dural sheath are extremely rare. Frequent and marked variation in the height of the falx cerebri has been reported at three levels of measurement: line A, between the tuberculum sellae and bregma; line B, from the tuberculum sellae and the internal surface of the skull forming an angle of 30° posterior to line A; and line C, between the tuberculum sellae and the internal surface of the skull along a line crossing the proximal end of the vein of Galen. Variations in the size and shape of the diaphragma sellae and its foramen are not uncommon. The presence of arachnoid granulations (AG) is considered a normal anatomical variation. The numbers of denticulate ligaments (DL) on each side of the spinal cord vary between 18 and 22.

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