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Which part of the brain secretes cerebrospinal fluid?
1. From the Choroid Plexus of the Brain
2. From the Venous Sinus of the Brain
3. From the Subarachnoid Space
4. None of these

1 Answer

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Correct Answer - Option 1 : From the Choroid Plexus of the Brain

Explanation:

Cerebrospinal fluid (CSF)

  • Cerebrospinal fluid (CSF), clear, colorless liquid that fills and surrounds the brain and the spinal cord and provides a mechanical barrier against shock.
  • Formed primarily in the ventricles of the brain, the cerebrospinal fluid supports the brain and provides lubrication between surrounding bones and the brain and spinal cord. 
  • The Choroid Plexus of the Brain secretes  Cerebrospinal Fluid.

Formation

  • Formed from the choroid plexus situated in the ventricles.
  • The choroid plexus is the tuft of capillary projections presents inside the ventricle.
  • The choroid plexus is covered by the pia matter and ependymal covering.
  • The active transport mechanism is involved in the secretion of CSF.

Properties of CSF

  • The volume is around 150 ml.
  • Rate of formation around 0.3ml/minute.
  • Specific gravity: 1.005
  • The reaction is alkaline.

Absorption of CSF

  • Mostly absorbed by the arachnoid villi into the dural sinus and spinal veins.
  • 500ml of CSF is formed every day and an equal amount is absorbed.

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