part of part of gray matter of spinal cord spinal cord gray commissure ventral gray commissure of spinal cord commissura grisea anterior medullae spinalis UMLS:C0228572 FMA:77038 ventral grey commissure of spinal cord SCTID:88806005 BIRNLEX:2676 UBERON:0014630 spinal cord anterior gray commissure anterior grey commissure of spinal cord dorsal gray commissure of spinal cord