caudal region of vertebral column
http://purl.obolibrary.org/obo/UBERON_0006076
http://purl.obolibrary.org/obo/UBERON_0006071
http://purl.obolibrary.org/obo/UBERON_0002090
http://purl.obolibrary.org/obo/UBERON_0006077