Model of human brain, studio shot laptop sleeve

AssetID: 114850733 / {Mike Kemp} / Model of human brain, studio shot _x000D_ _x000D_ The human brain has the same general structure as the brains of other mammals , but is larger than expected on the basis of body size among other primates . Estimates for the number of neurons (nerve cells) in the human brain range from 80 to 120 billion. Most of the expansion comes from the cerebral cortex , especially the frontal lobes , which are associated with executive functions such as self-control, planning, reasoning, and abstract thought. The portion of the cerebral cortex devoted to vision is also greatly enlarged in human beings, and several cortical areas play specific roles in language, a skill that is unique to humans. _x000D_ Despite being protected by the thick bones of the skull, suspended in cerebrospinal fluid , and isolated from the bloodstream by the blood-brain barrier , the human brain is susceptible to many types of damage and disease. The most common forms of physical damage are closed head injuries such as a blow to the head , a stroke , or poisoning by a variety of chemicals that can act as neurotoxins . Infection of the brain, though serious, is rare due to the biological barriers which protect it. The human brain is also susceptible to degenerative disorders, such as Parkinson's disease , multiple sclerosis , and Alzheimer's disease . A number of psychiatric conditions, such as schizophrenia and depression , are thought to be associated with brain dysfunctions, although the nature of such brain anomalies is not well understood. _x000D_ _x000D_ This page is not affiliated with, or endorsed by, anyone associated with the topic.