The tripartite structure of the undercoat in initial segments of Purkinje cell axons.
D000818:Animals; D001369:Axons / Q000166:cytology*; D005260:Female; D008854:Microscopy, Electron; D008870:Microtubules; D009186:Myelin Sheath; D011689:Purkinje Cells / Q000166:cytology*; D051381:Rats; D013569:Synapses