Question

Central nervous system consists of

• A. Brain
• B. Spinal cord
• C. Nerves and ganglia
• D. Both A and B

Answer 1

The correct option is D Both A and B

• The central nervous system (CNS) is the processing center for the nervous system. The two main organs of the CNS are the brain and spinal cord. The brain processes and interprets the sensory information sent from the spinal cord. Both the brain and spinal cord are protected by three layers of connective tissue, called meninges.
• Within the central nervous system is a system of hollow cavities, called 'ventricles'. The network of linked cavities in the brain (cerebral ventricles) is continuous with the central canal of the spinal cord. The ventricles are filled with cerebrospinal fluid, which is produced by specialized epithelium located within the ventricles, called the choroid plexus.
• Cerebrospinal fluid surrounds, cushions and protects the brain and spinal cord from trauma. It also assists in the circulation of nutrients to the brain.