STRUCTURAL AND ULTRASTRUCTURAL STUDY THE INTRACRANIAL PORTION OF THE TROCHLEAR NERVE IN THE DOG.
Abstract
In the present investigation, the right intracranial portion of the trochlear nerves was removed from six adult dogs weighing 40-50 kg and analyzed by light and electron microscopy. A significant number of unmyelinated fibers were observed in the analyzed nerves. Number, diameter, area and density of myelinated fibers were determined as were corresponding axon area and diameter and myelin sheath thickness. Myelinated fibers count produced a mean of 1482,25. Frequency histograms of myelin sheath thickness and fiber size show a bimodal distribution being 10,8 m the mean value of discrimination of the two populations. A similar proportion of large (47,45%) and small fibers (52,55%) is appraised. The small fibers population was present in a size mean of 6,44 m and occupies a 12,10% of the total surface of the nerve, on the contrary the large fibers, with size mean of 15,34 m ocupy a 60,20% of the nerve.Downloads
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