The autonomic nervous system affects:

Which one of the following organs in the human body is most affected due to shortage of oxygen?

The brain originates from which germ layer?

$P$ - The nervous system that relays impulses from the $CNS$ to skeletal muscles.
$Q$ - The nervous system that transmits impulses from the $CNS$ to involuntary organs and smooth muscles of the body.
$\quad\quad\quad P \quad\quad Q$

Which of the following nerves originates from the brain?

The self-governing nervous system is known as: