luminal space of central nervous system organ cavity lumen of central nervous system UBERON:0002561 The cavity that is enclosed by the central nervous system. In vertebrates this is the cavity that includes as parts ventricular cavities and the central canal of the spinal cord that develops from the lumen of the neura tube. neuraxis lumen lumen of central nervous system neuraxis cavity FMA:75007 cavity of ventricular system of neuraxis cavity of neuraxis BIRNLEX:1029