Pons: n. a structure on the brain stem that lies above the medulla and regulates sleep, arousal, consciousness, and sensory processes.
Because it is linked to the cerebellum, which controls balance and coordination, the pons plays a part in maintaining posture. Furthermore, it regulates the sleep/wake cycle and is responsible for the feeling of "falling" that occurs during sleep. It also functions to regulate consciousness, facial movement, and dreaming.
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