title: Histological and ultrastructural study of the muscular and nervous systems in Hydra. II. Nervous system.
mesh_terms: D000818:Animals; D003063:Cnidaria / Q000166:cytology*; D008853:Microscopy; D008854:Microscopy, Electron; D009417:Nerve Tissue / Q000166:cytology*; D009474:Neurons / Q000166:cytology