The blood is poured out beneath the dura on one or on both sides of the Falx cerebri, and as it accumulates near the vertex, the damage to the motor centres for the legs is usually more extensive than that to the centres for the arms.
"Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition."
Alexander Miles Alexis Thomson
Between this septum and the Falx an interval occurs, and through it the crural hernia usually descends.
"Surgical Anatomy"
Joseph Maclise