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nervous 
  adj 
1 very excitable or sensitive; highly strung 
2 often foll by: of apprehensive or worried 
I'm nervous of traffic  
3 of, relating to, or containing nerves; neural 
nervous tissue  
4 affecting the nerves or nervous tissue 
a nervous disease  
5 Archaic active, vigorous, or forceful 
♦  nervously  adv 
♦  nervousness  n 

autonomic nervous system 
  n the section of the nervous system of vertebrates that controls the involuntary actions of the smooth muscles, heart, and glands 
 Compare  →  somatic nervous system 
central nervous system 
  n the mass of nerve tissue that controls and coordinates the activities of an animal. In vertebrates it consists of the brain and spinal cord, (Abbrev.)  CNS  Compare  →  autonomic nervous system 
nervous breakdown 
  n any mental illness not primarily of organic origin, in which the patient ceases to function properly, often accompanied by severely impaired concentration, anxiety, insomnia, and lack of self-esteem; used esp. of episodes of depression 
nervous system 
  n the sensory and control apparatus of all multicellular animals above the level of sponges, consisting of a network of nerve cells (see neurone) 
 See also  →  central nervous system 
somatic nervous system 
  n  (Physiol) the section of the nervous system responsible for sensation and control of the skeletal muscles 
 Compare  →  autonomic nervous system 

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