- Biology Notes for UPSC IAS Prelims (Part II)
- Biology - Home
- Biology - Classification of Organisms
- Biology - Cell Division
- Biology - Virus
- Biology - Bacteria
- Biology - Fungi
- Biology - The Roots
- Biology - The Plant Stem
- Biology - The Plant Leaf
- Biology - The Flowers
- Biology - The Fruit
- Biology - Plant Diseases
- Biology - The Blood
- Biology - Blood Group
- Biology - Human Brain
- Biology - Skeleton System
- Biology - Endocrine System
- Biology - Endocrine Diseases
- Biology - Carbohydrate
- Biology - Proteins
- Biology - Fats
- Biology - Vitamins
- Biology - Minerals
- Biology - Genetic Terminology
- Organisms & their Chromosome Counts
- Biology - Viral Diseases
- Biology - Bacterial Diseases
- Branches of Biology
- Inventions & Discoveries in Biology
- Nobel Prize in Biology
- Biology Useful Resources
- Biology Part 2 - Online Quiz
- Biology Part 2 - Online Test
- Biology Part 2 - Quick Guide
- Biology - Useful Resources
- Biology - Discussion
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Biology - Human Brain
The brain of a human being is the central organ of the nervous system.
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 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 −
The naming is done according to the skull bones that overlie them.
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)