medulla oblongata morphology trait medulla oblongata molecular composition trait 2025-12-02T21:01:07Z Any measurable or observable characteristic related to the proportions of proteins, minerals, nutrients, gases, or other substances in the most caudal region of the brainstem that lies directly rostral to the spinal cord; includes regions responsible for autonomic functions such as digestion, breathing and control of heart rate. Trait.ontology VT:0011252