The weight of a normal adult human brain is approximately: (in $lbs.$)

The cerebral aqueduct is:

The cavity enclosed by the medulla oblongata of the brain is . . . . . . .

Respiratory and vomiting centres are located in

In the anatomy of man,the aqueduct of Sylvius occurs in:

Which of the following statements are correct about the cortex of the cerebrum? Choose the correct codes given below:
$(I)$. It consists of grey matter.
$(II)$. It shows prominent folds.
$(III)$. It consists of white matter.
$(IV)$. It contains motor areas,sensory areas,and association areas.