part of part of develops from develops from immediate transformation of organ part embryo dura mater falx cerebri http://upload.wikimedia.org/wikipedia/commons/f/ff/Falxcerebri.jpg The falx cerebri, also known as the cerebral falx, so named from its sickle-like form, is a strong, arched fold of dura mater which descends vertically in the longitudinal fissure between the cerebral hemispheres. It is narrow in front, where it is attached to the crista galli of the ethmoid; and broad behind, where it is connected with the upper surface of the tentorium cerebelli. Its upper margin is convex, and attached to the inner surface of the skull in the middle line, as far back as the internal occipital protuberance; it contains the superior sagittal sinus. Its lower margin is free and concave, and contains the inferior sagittal sinus. The falx cerebri is known to calcify with age. NCIT:C12890 EMAPA:18551 neuronames:1237 SCTID:279275004 FMA:83967 UMLS:C0228120 UBERON:0006059 Wikipedia:Falx_cerebri cerebral falx future falx cerebri