NCIt definition : The superior portion of the occipital bone on the dorsal side of the great foramen
of the skull; it is present during fetal development and later fuses with the occipital
bone.;
Alternative definition : CDISC: The superior portion of the occipital bone on the dorsal side of the foramen
magnum; it is present during fetal development and later fuses with the occipital
bone.;