title: Occurrence of an "extrafusal muscle fiber" in the spindle capsule of normal adult zebra-finches: an electron microscopical study.
mesh_terms: D000818:Animals; D001717:Birds; D008854:Microscopy, Electron; D009045:Motor Endplate / Q000648:ultrastructure; D009470:Muscle Spindles / Q000648:ultrastructure*; D009132:Muscles / Q000294:innervation / Q000648:ultrastructure*