Reflections on the evolution of the nervous system.
D000818:Animals; D005075:Biological Evolution; D007839:Functional Laterality; D005724:Ganglia / Q000033:anatomy & histology; D006801:Humans; D007313:Insecta / Q000033:anatomy & histology; D009420:Nervous System / Q000033:anatomy & histology; D009474:Neurons / Q000502:physiology; D014714:Vertebrates / Q000033:anatomy & histology