Naked axons and symmetrical synapses in an elementary nervous system.
D001369:Axons; D009420:Nervous System / Q000033:anatomy & histology*; D009474:Neurons / Q000033:anatomy & histology*; D013569:Synapses / Q000033:anatomy & histology*
NERVOUS SYSTEM/anatomy and histology; NEURONS/anatomy and histology; SYNAPSES/anatomy and histology