Medulla Oblongata

**Semantic type:** Body Part, Organ, or Organ Component

**Definition:** The lower portion of the brainstem located between the pons and the spinal cord. This structure contains several descending and ascending tracts, lower cranial nerve nuclei, a significant proportion of the reticular system of the brainstem and other structures.

**Synonyms:** - BRAIN, MEDULLA OBLONGATA - MEDULLA OBLONGATA - Medulla - Medullary - Myelencephalon - medulla oblongata