The process in which the anatomical structure of the medulla oblongata is generated and organized. The medulla oblongata lies directly above the spinal cord and controls vital autonomic functions such as digestion, breathing and the control of heart rate. [ GOC:jid http://purl.obolibrary.org/obo/go/references/0000021 GOC:dph GOC:dgh GOC:cls http://openisbn.com/search.php?q=0838580343&isbn=1/ ]