mammalian phenotype nervous system phenotype CNS phenotype MP:0003631 MP:0005368 MP:0005383 MPheno.ontology PNS phenotype central nervous system phenotype peripheral nervous system phenotype the observable morphological and physiological characteristics of the extensive, intricate network of electochemical structures in the body that is comprised of the brain, spinal cord, nerves, ganglia and parts of the receptor organs that are manifested through development and lifespan