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Get Answers to all your Questions
Q5. Write short notes on the following:
(d) Hindbrain
Answers (1)
The hindbrain consists the cerebellum, pons varolii, and medulla oblongata:
Cerebellum:
- It is located at the base of the cerebellum.
- The outer cerebellar cortex is made of grey matter and the inner cerebellar medulla is made of white matter.
- The white matter has fibre tracts which connect the cerebellum with the medulla oblongata and the cerebrum.
- Functions:
- It coordinates muscular activity and the balance of the body.
- The impulse of performing muscular activity originates in the cerebrum.
- It modulates the voluntary movements initiated in the cerebrum.
Pons Varolii:
- It is made of a thick bundle of white nerve fibres.
- It lies above the medulla oblongata.
- Functions:
- It coordinates the two lobes of the cerebellum.
- The pneumotaxic centre which controls breathing is located in the pons varolii.
Medulla oblongata:
- It is located at the base of the skull.
- It is conical in shape.
- It continues behind the brain as the spinal cord.
- Injury to the medulla oblongata results in death.
- Functions:
- It acts as a pathway and conducts impulses from the spinal cord to the brain.
- It controls the activities of the internal organs, heartbeat and breathing.
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