Biology – Human Brain – Notes For W.B.C.S Examination.

জীববিজ্ঞান – মানব মস্তিষ্ক – WBCS পরীক্ষার জন্য নোট।

Introduction

• 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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