Ключевые слова: acoelomate, bilateral, biologicalspecimen, biology, bodystructure, bodywall, celllayer, cephalization, ciliatedepithelium, crosssection, digestivecavity, dorsoventral, educationalslide, eyespots, flatbodied, flatworm, free living, gutbranching, headregion, highmagnification, internalorgans, intestine, labstudy, microscope, microscopeimage, microscopeview, microscopy, nervoussystem, organism, pharynx, planaria, planarian, platyhelminthes, regeneration, regenerationability, reproductiveorgans, simpledigestive, slidepreparation, softbody, stainedorganism, stainedpreparation, stainedslide, tailregion, tissueorganization, triploblastic, turbellaria, ventralnerve, wholemount, zoology,