title: Fine structure of the optic nerve of Lampetra fluviatilis (Cyclostomi).
mesh_terms: D000818:Animals; D005399:Fishes / Q000033:anatomy & histology*; D007798:Lampreys / Q000033:anatomy & histology*; D008854:Microscopy, Electron; D009474:Neurons / Q000648:ultrastructure; D009900:Optic Nerve / Q000648:ultrastructure*