Abstract
The effect of testosterone propionate (TP) on nerve regeneration was studied in young adult male rats. The TP treatment promoted axonal outgrowth of the transected hypoglossal nerve as indicated by a larger proportion of hypoglossal neurons labeled by retrograde transport after injection of horseradish peroxidase (HRP) into the tongue 2 weeks after the lesion. It was postulated that TP exerted its effect on the metabolic activity of the axotomized neurons and influenced the healing process of the nerve. The HRP axonal transport method further revealed that regeneration of the severed nerve resulted in an alteration of the somatotopic organization of the hypoglossal nucleus and a random growth of the axons into branches of the nerve in all the rats irrespective of the treatment.
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