surrounds surrounds central canal of spinal cord spinal cord gray commissure lamina X of gray matter of spinal cord The band of grey substance spanning the midline of the spinal cord that surrounds the central canal. spinal lamina X lamina X HBA:9525 Rexed's lamina X central glial substance central gelatinous substance spinal cord grey commissure SCTID:362427009 neuronames:1702 neuronames:1649 FMA:77036 rexed lamina X gray commissure of spinal cord spinal area X spinal cord gray commissure UBERON:0004677 Wikipedia:Gray_commissure grey commissure of spinal cord FMA:68871 grey commissure lamina X BIRNLEX:2669 DHBA:12647 lamina of gray matter of spinal cord