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The cerebrum is divided into two large hemispheres. There are fissures that indent its surface called sulci and ridges projecting outward from its surface called gyri. It is the largest part of the brain. Thinking, and the senses and voluntary activity are controlled by the cerebrum. Behind the cerebrum is the cerebellum. This part of the brain is divided into two lateral hemispheres and is the part of the brain that controls balance and coordination. The lower section of the brain is called the medulla oblongata. It connects the brain to the spinal cord and is responsible for involuntary, but vital body functions including heartbeat, breathing, digestion.
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