The 3 segments of the brainstem are the midbrain, pons & this, which regulates coughing & sneezing
This is 
accomplished through the brain stem's 3 regions: the Midbrain, the Pons, and the 
... Reflexive actions such as coughing, sneezing, and vomiting are... [DOC] [TLE] Brain and the Cranial Nerves [PAR] Mesencephalon, Mesencephalon, Brain stem (midbrain).