MORPHOLOGICAL considerations led Dry1 to distinguish three stages in the hair-growth cycle; namely, anagen, catagen and telogen. Anagen referred to the period of active growth, including development of the follicle and subsequent synthesis of the hair. The rapid growth in anagen abruptly ceases and the follicle is largely destroyed in a brief phase, termed by Dry as catagen. The follicle remnant and associated hair are in a phase of apparent inactivity known as telogen in Dry's system. This classification of the hair-growth cycle has been extended2 by subdividing anagen into six phases on the bases of detailed histological observations.
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DAVIS, B. Phases of the Hair-Growth Cycle. Nature 194, 694 (1962). https://doi.org/10.1038/194694a0
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