title: Fine structure of the paraventricular organ of Xenopus laevis tadpoles.
mesh_terms: D000818:Animals; D001001:Anura / Q000033:anatomy & histology*; D003593:Cytoplasm; D004805:Ependyma / Q000166:cytology; D006652:Histological Techniques; D007031:Hypothalamus / Q000166:cytology*; D008854:Microscopy, Electron; D009411:Nerve Endings; D009474:Neurons / Q000166:cytology; D009489:Neurosecretion