If the sulci are deep, they are called fissures. ![]() It contains folds and convolutions on its surface, with the ridges found between the convolutions called gyri and the valleys between the gyri called sulci (plural of sulcus). The cerebrum is divided into the right and left hemispheres and is the largest part of the brain. The three main parts of the human brain are the cerebrum, cerebellum, and brainstem. The brain is an organ composed of nervous tissue that commands task-evoked responses, movement, senses, emotions, language, communication, thinking, and memory. ![]() The human brain is perhaps the most complex of all biological systems, with the mature brain composed of more than 100 billion information-processing cells called neurons.
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