title: Ultrastructure of the nerve plexus in flatworms. I. Peripheral organization.
mesh_terms: D000818:Animals; D001369:Axons; D005075:Biological Evolution; D004847:Epithelial Cells; D004848:Epithelium / Q000648:ultrastructure; D002479:Inclusion Bodies; D008854:Microscopy, Electron; D008870:Microtubules; D008928:Mitochondria; D009132:Muscles / Q000648:ultrastructure; D009420:Nervous System / Q000648:ultrastructure*; D009457:Neuroglia / Q000648:ultrastructure; D009474:Neurons / Q000648:ultrastructure; D013569:Synapses / Q000648:ultrastructure; D014419:Turbellaria / Q000648:ultrastructure*; D014617:Vacuoles