Question

Below is a diagram of the human brain.
Select the correct match between various structures labelled as A, B, C, D and their concerned function.

• A. A – Connects third ventricle to fourth ventricle
• B. B – Controls locomotory activity
• C. C – Maintains circadian rhythm
• D. D – Controls emotions

Answer 1

The correct option is A A – Connects third ventricle to fourth ventricle

(A) Cerebral aqueduct or aqueduct of Sylvius is a canal that passes through the midbrain and connects the third ventricle (diocoel) with the fourth ventricle (metacoel) of the brain.

(B) Pons varolii is the neuronal link between cerebral cortex and cerebellum. The moderation of the respiratory centre is carried out by the pneumotaxic centre present in pons. The locomotory activities are not controlled by pons but by the cerebellum.

(C) Medulla oblongata is the part of the hindbrain having centres to control respiration. gastric secretions and cardiovascular reflexes. The pineal gland present in the epithalamus controls the circadian rhythm.

(D) Thalamus is the major coordinating and relay centre of the cerebral cortex. Whereas, emotions are controlled by the hypothalamus and limbic system.