Human brain.

 The human brain is an integral part of the human nervous system, and the spinal cord makes the central nervous system. The brain consists of the cerebrum, the brainstem and the cerebellum. It controls most of the body's work, processing, compiling, and linking information obtained from mental images, and making decisions based on instructions sent throughout the body. The brain is contained, and protected, by skull bones in the head.

The cerebrum is the largest part of the human brain. It is divided into two hemispheres of the brain. The cerebral cortex is the outer layer of gray, encompassing the essence of the white matter. The cortex is divided into neocortex and very small allocortex. The neocortex is made up of six neuronal layers, while the allocortex has three or four. Each part of the world is divided into four lobes - the anterior, temporal, parietal, and occipital lobes. The anterior lobe is associated with management functions including self-control, planning, consultation, and abstract thinking, while the occipital lobe is devoted to vision. Within each lobe, cortical areas are associated with specific functions, such as the sensory, motor, and motor areas. Although the left and right hemispheres are as wide as the same position and function, some functions are associated with one side, such as the tongue in left and right view. The hemispheres are connected by public nerve tracts, the largest of which is the corpus callosum.

The cerebrum is connected by a brainstem to the spinal cord. The brainstem contains the midbrain, pons, and medulla oblongata. The cerebellum is connected to the brainstem by two pairs of tracts. Inside the cerebrum is a ventricular system, consisting of four ventricles connected by the production and distribution of cerebrospinal fluid. Below the cerebral cortex there are several important structures, including the thalamus, epithalamus, pineal gland, hypothalamus, pituitary gland, and subthalamus; limbic structures, including the amygdala and hippocampus; claustrum, various nuclei of the basal ganglia; basal forebrain structures, and three limb organs. Brain cells include neurons and supporting glial cells. There are more than 86 billion neurons in the brain, with more or less the same number of other cells. Brain function is triggered by the activation of neurons and the release of neurotransmitters in response to sensory nerves. Connecting neurons form neural pathways, neural circuits, and extended network systems. All cycles are driven by the neurotransmission process.

The brain is protected by a skull, suspended in cerebrospinal fluid, and separated from the bloodstream by a blood and brain barrier. However, the brain is at risk of injury, disease and infection. Injuries can be caused by trauma, or blood loss known as stroke. The brain is affected by degenerative disorders, such as Parkinson's disease, dementia including Alzheimer's disease, and multiple sclerosis. Psychiatric conditions, including schizophrenia and clinical depression, are thought to be associated with brain dysfunction. The brain can also be a place for plants, both dangerous and evil; these mostly come from other sites in the body.

The study of brain structure is neuroanatomy, while studying its function is neuroscience. Many techniques are used to study the brain. Species from other animals, which may be microscopic, have traditionally provided many details. Medical imaging techniques such as effective neuroimaging, and electroencephalography (EEG) are important for brain study. The medical history of people with brain damage provided insight into the functioning of each part of the brain. Brain research has emerged over time, through philosophical, experimental, and theoretical categories. The emerging stage can be to mimic brain function. 

Traditionally, mental philosophy has tried for centuries to address the question of the type of understanding and the problem of the mental body. The pseudoscience of phrenology attempted to find human characteristics in the cortex regions in the 19th century. In science fiction, brain implants are considered in myths such as 1942 Donovan's Brain.