nervous breakdown(n = noun.state) - a severe or incapacitating emotional disorder;
is a kind of breakdown, crack-up
has particulars: nervous exhaustion, nervous prostration, neurasthenia

autonomic nervous system, breakdown, central nervous system, nervous, nervous disorder, nervous exhaustion, nervous prostration, nervous strain, nervous system, nervous tension, nervous tissue, parasympathetic nervous system, peripheral nervous system, sympathetic nervous system