title: The effect of pre- and postnatal undernutrition on the calibre growth of central motor fibres: a morphometric ultrastructural study on rat cortico-spinal tract.
abstract: The effect of early in life instituted undernutrition on the calibre growth of cortico-spinal motor fibres was studied electron microscopically at three different developmental stages in the rat. The total diameters of these motor fibres were measured from a defined level of the medulla oblongata and plotted in histograms. In undernourished rats. Early initiated nutritional rehabilitation through controlled cross-fostering revealed that the impaired calibre growth was reversible, and thus completely restituted at the age of 180 days. It is concluded that early initiated protein-calorie undernutrition affects this central motor pathway in a similar way, as it affects a peripheral motor nerve (cf. Sima, 1974).
mesh_terms: D000818:Animals; D001699:Biometry; D005260:Female; D008526:Medulla Oblongata / Q000473:pathology; D009413:Nerve Fibers, Myelinated / Q000648:ultrastructure; D011247:Pregnancy; D011502:Protein-Energy Malnutrition / Q000473:pathology*; D011712:Pyramidal Tracts / Q000648:ultrastructure*; D051381:Rats