Neurogenesis of sensory neurons in the primate olfactory system after section of the fila olfactoria.

Axotomy of the olfactory sensory neurons in the adult primate squirrel monkey induces retrograde degeneration of the perikarya in the nasal neuroepithelium. The process of neuronal degeneration is rapid and by the 10th day the olfactory neuroepithelium is deprived of all mature neurons. Basal cells, supporting cells and the Bowman's glands are unaffected by the surgical procedure. The degeneration of the neurons is followed by intense mitotic activity of the basal cells of the neuroepithelium. At 30 days survival several young, mature neurons are present again in the neuroepithelium. At 60--90 survival days the neuroepithelium reacquires a population of neurons similar to controls. The persistence of neurogenesis and the replacement of experimentally degenerated neurons in an adult, non-human primate is briefly discussed.