title: Morphometric synaptology of gracilo-diencephalic relay cells: an electron microscopic study in the cat using retrograde transport of horseradish peroxidase.
abstract: Gracilo-diencephalic relay cells were identified with the aid of retrograde transport of the horseradish peroxidase. Section embedding permitted light-microscopic identification and selection of relay cells and adjacent unlabelled neurons for ultrastructural study. Electron-microscopic analysis of the boutons which contacted the perikaryal surface of the cells revealed a statistically significant positive relationship between bouton covering ratio and cell body size for both labelled and unlabelled neurons. Estimates of the density of boutons also showed a positive correlation between the size of the cell body and the density of terminals contacting its surface. The functional implications of these findings are discussed.
mesh_terms: D000818:Animals; D001370:Axonal Transport; D002415:Cats; D004027:Diencephalon / Q000502:physiology* / Q000648:ultrastructure; D004525:Efferent Pathways / Q000502:physiology* / Q000648:ultrastructure; D006735:Horseradish Peroxidase; D008854:Microscopy, Electron; D013569:Synapses / Q000502:physiology* / Q000648:ultrastructure
chemical_list: D006735:Horseradish Peroxidase