Which of the following is not a function of the brainstem? 

Maintenance of balance and posture is the function of the cerebellum. The cerebellum is not a part of the brainstem. The brainstem includes the midbrain, the pons and the medulla oblongata. Respiratory centres are present the brain stem (in the medulla and the pons). The optic lobes (midbrain) coordinate movements of the head, eyes, and trunk in response to visual and auditory stimuli. The cardiovascular centre that regulates the heartbeat and blood pressure is located in the medulla oblongata.