title: [Ultrastructural study of the human external urethral sphincter. 1. Innervation. 2. Characteristics of muscle fiber].
mesh_terms: D000320:Adrenergic Fibers / Q000648:ultrastructure; D006801:Humans; D008854:Microscopy, Electron; D009130:Muscle, Smooth / Q000294:innervation / Q000648:ultrastructure; D014521:Urethra / Q000294:innervation* / Q000648:ultrastructure