SEM studies on age related changes in the surface structures of rat hairs

In albino rats of four age groups (male and female; 1, 6, 12 and 36 months) telogen hairs of the back were investigated in scanning electron microscopy at defined locations. The length of the cuticular 'scales' as well as the thickness of the hair shaft decreased significantly in the 36 month group of both sexes. In addition the scales of this group had irregular contours, cracks and spindle shaped inclusions.