Biology – Human Brain – Notes For W.B.C.S. Examination.
জীববিজ্ঞান – মানব মস্তিষ্ক – WBCS পরীক্ষার জন্য নোট ।
- The brain of a human being is the central organ of the nervous system.Continue Reading Biology – Human Brain – Notes For W.B.C.S. Examination.
- The human brain consists of three parts namely the cerebrum, the brainstem and the cerebellum.
- The brain of a human being plays significant role, as it controls most of the activities of the human body.
- The brain is located inside the head, and protected by the skull bones.
- The brain consists of more than 86 billion neurons and almost equal number of other cells as well.
- Brain activity is made possible because of the interconnections of all the neurons that are linked together.
- The study of brain functions is known as neuroscience.
- An adult human brain weighs about 1.2 to 1.4 kg (i.e. average weight); which is about 2% of the total body weight.
Parts of Human Brain
- A human brain is primarily classified as the −
- Forebrain
- Midbrain
- Hindbrain
- Forebrain is largely made up of cerebrum, thalamus, hypothalamus and pineal gland.
- Midbrain is largely made up of a portion of the brainstem.
- Hindbrain largely made up of the remaining brainstem, cerebellum and pons.
- Further, the (brain) hemisphere is conventionally classified into four lobes namely −
- Frontal lobe
- Parietal lobe
- Temporal lobe
- Occipital lobe
- The naming is done according to the skull bones that overlie them.
Cerebrum
- Divided into nearly symmetrical left and right hemispheres by a deep groove, the cerebrum is the largest part of the human brain.
- Cerebrum normally controls higher brain functions including language, logic, reasoning, and creativity.
Functions of Human Brain
- Major functions of human brain are −
- Perceive or sense the signal coming from the (external) environment
- Giving sense of feelings and emotion
- Regulating and controlling the human behaviors
- Regulating and controlling the physical action
- Regulating the memory function
- Process of thinking (and other cognitive process)
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