Which one of the following statements are correct?

(i) The electrical potential difference across the plasma membrane at depolarized state is called the action potential, which is also termed as nerve impulse.

(ii) A synapse is formed by the membranes of a pre-synaptic neuron and a post-synaptic neuron, which may or may not be separated by a gap called synaptic cleft.

(iii) Impulse transmission across electrical synapse is always faster than that across a chemical synapse.

(iv) Electrical synapses are commonly found in our system.

(v) The axon terminals contain vesicles filled with neurotransmitter.

(vi) Brain is covered by cranial menings consisting of an inner layer dura mater; middle layer arachnoid and outer layer pia mater.

(vii) A deep cleft divides the cerebrum transversely into halves which are termed as left and right cerebral hemispheres.

(viii) The two cerebral hemispheres are connected by a tract of nerve fibres called corpus callosum.

(ix) The hypothalamus contains a number of centers which control body temperature, urge of eating and drinking.

(x) The region called as the association area are not responsible for complex function like intersensory associations, memory and communication.

(xi) A canal called the cerebral aqueduct passes through the midbrain.

(xii) The ventral portion of the midbrain consists mainly of four lobes called corpora quadrigemina.

Choose the correct option given below: