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Forebrain: Cerebrum MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET

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Forebrain: Cerebrum

Forebrain: Cerebrum

  • The cerebral hemispheres or cerebrum is the largest part of the brain occupying about two-thirds of the entire brain. 
  • It consists of left and right hemispheres connected by a large bundle of myelinated fibres, the corpus callosum and other smaller fibre bundles.
  • The outer portion of the cerebrum is called the cerebral cortex that makes up the grey matter of the cerebrum.
  • The surface of the cortex is highly folded. 
  • The upward folds are called gyri (sing. gyrus).
  • They alternate with the downward grooves called or sulci (sing. sulcus).
  • Below the grey matter millions of myelinated nerve fibres are present that connect the neurons of the cerebral cortex with those located elsewhere in the brain. 
  • The large concentration of myelinated nerve fibres gives this tissue an opaque white appearance. Hence they are collectively called White matter.
  • In each cerebral hemisphere, three types of functional areas can be seen as:

                       Sensory areas: They receive impulses from the receptors.
                       Association areas: They interpret the input, store the input and initiate a response in light of similar past experience.                             Thus the associated areas are involved in memory, learning and reasoning.
                       Motor areas: They transmit impulses to the effectors.

  • Each cerebral hemisphere of the cerebrum is divided into four lobes: frontal, parietal, temporal and occipital lobes. 
  • The central sulcus separates the frontal lobe from the parietal lobe. 
  • The lateral sulcus separates the frontal lobe from the temporal lobe. 
  • The parieto-occipital sulcus separates the parietal lobe from the occipital lobe

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