State the functions of the human brain.

Which part of the brain acts like a defense castle,controls moods,and plays an important role in emotional behavior,such as aggression and remembering fear?

In the given diagram,what does '$A$' represent?

Which of the following nerves can inhibit the heartbeat?

Read the following statements:
$(a)$ The peripheral nervous system is divided into the somatic nervous system and the autonomic nervous system.
$(b)$ The central nervous system includes the brain and the spinal cord.
$(c)$ Afferent nerve fibers transmit impulses from the brain to the sensory organs.
How many of the above statements are incorrect?

The second cranial nerve is: