Brain

Encephalon

The largest part of the central nervous system, weighing approximately 1.4 kg in adults. It consists of the cerebrum (two hemispheres with frontal, parietal, temporal, and occipital lobes), the cerebellum, and the brainstem (midbrain, pons, medulla oblongata). Protected by the meninges and cerebrospinal fluid.

種類 Organ
器官系 Nervous
身体部位 Brain
ラテン語名 Encephalon
FMA ID 50801

機能

The command center of the nervous system, responsible for processing sensory information, controlling motor functions, regulating homeostasis, and generating consciousness, thought, memory, emotion, and language.

臨床的意義

Stroke (cerebrovascular accident) is a leading cause of disability. Traumatic brain injury ranges from concussion to severe diffuse axonal injury. Neurodegenerative diseases include Alzheimer's, Parkinson's, and ALS.

下位構造

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よくある質問

What are the main parts of the brain?
The brain is divided into three main regions: the cerebrum (the largest part, responsible for higher functions such as thought, language, and voluntary movement), the cerebellum (coordinating movement and balance), and the brainstem (regulating vital autonomic functions including breathing, heart rate, and consciousness). The cerebrum is further divided into four lobes: frontal, parietal, temporal, and occipital.
How much does the brain weigh?
The adult human brain weighs approximately 1,300–1,400 grams (about 3 pounds), representing roughly 2% of body weight. Despite its small mass, it consumes approximately 20% of the body's total energy and oxygen supply. Brain volume is approximately 1,200–1,500 cubic centimeters, with considerable variation among individuals.
What is the brain protected by?
The brain is protected by the skull (cranium), three layers of membranes called meninges (dura mater, arachnoid mater, and pia mater), and cerebrospinal fluid (CSF) that cushions the brain within the subarachnoid space. The blood-brain barrier, formed by specialized endothelial cells in cerebral blood vessels, further regulates which substances can enter brain tissue.

関連構造

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Educational Disclaimer

This content is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for medical decisions.

Data sources: Terminologia Anatomica, Foundational Model of Anatomy, Wikidata.