title: Electron microscopical observations on Kölliker's and Hatschek's pit and on the wheel organ in the head region of Amphioxus (Branchiostoma lanceolatum).
mesh_terms: D000818:Animals; D002816:Chordata, Nonvertebrate / Q000166:cytology / Q000502:physiology*; D002923:Cilia; D003593:Cytoplasm; D003594:Cytoplasmic Granules; D004702:Endocrine Glands; D004847:Epithelial Cells; D004848:Epithelium / Q000648:ultrastructure; D006257:Head / Q000166:cytology; D008854:Microscopy, Electron; D008870:Microtubules; D009055:Mouth / Q000166:cytology; D009474:Neurons / Q000648:ultrastructure; D010903:Pituitary Gland, Anterior; D012679:Sense Organs; D012903:Smell