Life Processes in Living Organisms — Science STD 9 — Question
Maharashtra BoardEnglish MediumSTD 9ScienceLife Processes in Living Organisms5 Marks
Question
Describe the structure of the central nervous system.
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Answer
The central nervous system consists of the brain and spinal card.
The organization of the brain is extremely delicate and highly evolved.
The brain is the main controlling part of the nervous system and is safely located in the cranial cavity. The spinal cord is protected by the vertebral column.
In the space between the delicate central nervous system and its bony covering are the protective layers called the meninges.
Cavities present in various parts of the brain are called ventricles whereas the long tubular cavity of the spinal cord is called the central canal.
The ventricles, central canal and spaces between the meninges are filled with cerebro?spinal fluid.
This fluid supplies nutrients to the central nervous system and protects it from shock.
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