Codeine may cause nausea and vomiting by activating the chemoreceptor trigger zone in the

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The medulla controls vital autonomic functions.Codeine can cause nausea and vomiting by acting on the medulla in the brainstem.The thalamus controls reciprocal connections with the cerebral cortex.The hypothalamus functions in integrative control of autonomic functions.Both the thalamus and hypothalamus are part of the diencephalon of the brain.The frontal lobe controls voluntary motor functions and is part of the cerebral hemispheres.

Codeine May Cause Nausea and Vomiting by Activating the Chemoreceptor