gray matter gray matter of spinal cord BAMS:Scgrey grey substance of spinal cord spinal cord gray matter NLXANAT:100204 UMLS:C0475853 neuronames:2619 DHBA:146035048 grey matter of spinal cord gray substance of spinal cord EMAPA:35792 SCTID:279441003 NCIT:C32696 uberon substantia grisea medullae spinalis gray matter of spinal cord MA:0000002 The ridge-shaped grey matter of the spinal cord that extends longitudunally through the center of each half of the spinal cord, and are largely or entirely composed of nerve cell bodies and their dendrites and some supportive tissue. FMA:256580 UBERON:0002315 spinal cord grey matter spinal cord grey substance