The mammalian hair follicle represents a unique, highly regenerative neuroectodermal– mesodermal interaction system that contains numerous stem cells. It is the only organ in the mammalian organism that undergoes life-long cycles of rapid growth (anagen), regression (catagen), and resting periods (telogen).
Hair shaft abnormalities are fascinating and can provide a diagnostic challenge. Current knowledge of structural changes in hair has been amplified by scanning and transmission electron microscopy (SEM and TEM). PDF NOT AVAILABLE. Contact [email protected] for a copy of the article.