Search results for "Myelin sheaths"
showing 2 items of 2 documents
Mechanisms of protein expression in the rat optic nerve: Modifications by alcohol exposure
2005
espanolObjetivos: Nuestros trabajos previos han demostrado que el consumo abusivo de etanol durante la gestacion induce retraso en el desarrollo y alteraciones estructurales en los ojos y en la vision (Pinazo-Duran et al., Teratology 93; Eur J Ophthalmol 97; Stromland and Pinazo-Duran, Teratology 94; Alcohol Alcoholism 02). Nos proponemos estudiar a un nivel celular y molecular si el etanol modifica la expresion de proteinas marcadoras del desarrollo glial durante los estadios pre- y postnatal de la rata, que puedan contribuir a la dismorfogenesis del nervio optico. Metodo: Para estudiar las acciones del etanol sobre el desarrollo del nervio optico de ratas sometidas a un proceso de alc…
Changes of the ratio between myelin thickness and axon diameter in the human developing sural nerve
1978
Axon caliber and myelin sheath thickness of individual nerve fibers were evaluated in the developing human sural nerve using three different methods of measurement: 1. ocular micrometer evaluation of large fibers, 2. photographic enlargements for evaluating large numbers of nerve fibers of all sizes, and 3. electron microscopic enlargements for more precise measurements in selected nerves. The average axonal diameter doubles from 5 months gestation to about 5 years of age. Large fiber group axons increase, during the same period, by a factor of 3--3.5 with a slight decrease thereafter. The myelin thickness increases more slowly, but continuously, between 5 months gestation until the age of …