title: Innervation and fine structure of the precapillary sphincter in the frog retrolingual membrane.
mesh_terms: D000818:Animals; D002196:Capillaries; D002467:Cell Nucleus; D008566:Membranes / Q000166:cytology; D008833:Microcirculation; D008854:Microscopy, Electron; D008856:Microscopy, Fluorescence; D009130:Muscle, Smooth / Q000166:cytology / Q000294:innervation; D011894:Rana pipiens / Q000033:anatomy & histology*; D014059:Tongue / Q000033:anatomy & histology* / Q000098:blood supply / Q000166:cytology / Q000294:innervation