Class X | Brain

  • Brain is the highest coordinating in the body.
  • situated in the cranial cavity of the skull.
  • The bone of cranium or brain box protect this delicate organ from mechanical injury.
  • Inside the box, the brain is contained in a fluid-filled balloon which provides further shock absorption.
  • The brain is soft, whitish organ.
  • Brain is 1.2 -1.4 kg and forms about 98% of the weight of the whole central nervous system.
  • It has about 100 billion neurons.
  • Brain is surrounded by three membranes called meninges which provide protection to it.
  • The space between these three meninges is filled with cerebrospinal fluid which protects the brain from
  • mechanical shocks.
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