title: [The ultrastructure of portions of the cat spinal cord gray matter connected to fibers of different descending tracts].
abstract: Definite ultrastructural features were found in the regions of the cat spinal grey matter connected with different descending pathways, especially in the structure of dendritic membranes and relative quantities of axon terminals. Two types of destructive changes in myelinated axons and axon terminals in these regions were observed during experimental degeneration of descending fibres. Axon terminals of small size and F-type vesicles were subjected to degeneration after pyramidal tract lesion, while large terminals of both S-type and F-type were affected after sectioning of extrapyramidal tracts.
mesh_terms: D000818:Animals; D002415:Cats; D009434:Neural Pathways; D013116:Spinal Cord / Q000648:ultrastructure*; D013569:Synapses / Q000648:ultrastructure
vernacular_title: Osobennosti ul'trastruktury uchastkov serogo veshchestva spinnogo mozga koshki, sviazannykh s voloknami razlichnykh niskhodiashchikh traktov