Which cranial nerve has the highest number of branches?

In rabbits,optic lobes are small because the eyesight is controlled by:

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

Read the following statements carefully and select the correct option:
$I.$ The medulla is connected to the spinal cord.
$II.$ Medulla contains controlling centres for respiration,cardiovascular reflexes and gastric secretion.
$III.$ Cerebellum has a very convoluted surface in order to provide the additional space for more neurons.

The $Vagus$ nerve is the $...$ cranial nerve.

The parts of the human brain that help in the regulation of sexual behaviour,expression of excitement,pleasure,rage,fear,etc.,are: