part of organ central nervous system spinal cord (...) at some stage of its development, every chordate exhibits five uniquely derived characters or synapomorphies of the group: (...) (4) a single, tubular nerve cord that is located dorsal to the notochord (...) (reference 1); The neural tube is destined to differentiate into the brain and spinal cord (the central nervous system) (reference 2).[well established][VHOG] AAO:0010151 BAMS:SP BAMS:Spinal BM:SpC BTO:0001279 CALOHA:TS-0953 DHBA:12890 DMBA:17651 EFO:0000110 EHDAA2:0001255 EHDAA:2863 EMAPA:17577 EV:0100316 FMA:7647 GAID:695 MA:0000216 MAT:0000183 MESH:D013116 MIAA:0000183 OpenCyc:Mx4rvVjjk5wpEbGdrcN5Y29ycA Part of the central nervous system located in the vertebral canal continuous with and caudal to the brain; demarcated from brain by plane of foramen magnum. It is composed of an inner core of gray matter in which nerve cells predominate, and an outer layer of white matter in which myelinated nerve fibers predominate, and surrounds the central canal. (CUMBO) Part of the central nervous system which descends from the hindbrain within the vertebral column.[AAO] SpC TAO:0000075 TODO - add superclass to unify with VNC? UMLS:C0037925 VHOG:0000601 XAO:0000020 ZFA:0000075 cerebro-cerebellar fissure cerebrocerebellar fissure fissura cerebro-cerebellaris fissura cerebrocerebellaris http://braininfo.rprc.washington.edu/centraldirectory.aspx?ID=22 medulla spinalis spinal cord structure spinal medulla