part of part of innervated by innervated_by develops from develops from musculature skeletal muscle of trunk epaxial myotome region mesoderm-derived structure musculature of trunk dorsal ramus of spinal nerve epaxial musculature XAO:0003229 UBERON:0008778 Musculature that is derived from the epaxial myotome region, ventral to the horizontal septum of the vertebrae. Epaxial muscles include other (dorsal) muscles associated with the vertebrae, ribs, and base of the skull. AAO:0000142 epaxial muscle