title: Unmyelinated axons in the pyramidal tract of the cat.
abstract: Ultrastructural preparations revealed the presence of unmyelinated axons in the pyramidal tract (PT) of the adult cat. At the level of the medulla oblongata, unmyelinated axons constituted 8-15% of the total PT population. Axon diameters ranged from 0.05 to 0.06 micron with a mean of 0.18 micron. Although axons were distributed throughout the PT, their density was highest in the medial part.
mesh_terms: D000818:Animals; D001369:Axons / Q000648:ultrastructure*; D002415:Cats; D008854:Microscopy, Electron; D009412:Nerve Fibers / Q000648:ultrastructure*; D009413:Nerve Fibers, Myelinated / Q000648:ultrastructure; D011712:Pyramidal Tracts / Q000033:anatomy & histology*