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Phases of the Hair-Growth Cycle

Naturevolume 194page694 (1962) | Download Citation



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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  1. 1

    Dry, F. W., J. Genet., 16, 287 (1926).

  2. 2

    Chase, H. B., Rauch, H., and Smith, V. W., Physiol. Zool., 24, 1 (1951).

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    Butcher, E. O., Anat. Rec., 61, 5 (1934).

  4. 4

    Chase, H. B., Physiol. Rev., 34, 113 (1954).

  5. 5

    Flesch, P., in Physiology and Biochemistry of the Skin, edit. by Rothman, S., 601 (Univ. Chicago Press, 1954).

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    Montagna, W., The Structure and Function of the Skin (Academic Press, Inc., New York, 1956).

  7. 7

    Montagna, W., in The Cell, edit. by Brachet, J., and Mirsky, A. E., 5, 267 (Academic Press, New York and London, 1961).

  8. 8

    Montagna, W., and Van Scott, E. J., in The Biology of Hair Growth, edit. by Montagna, W., and Ellis, R. A., 39 (Academic Press, Inc., New York, 1958).

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    • B. K. DAVIS

    Present address: Worcester Foundation for Experimental Biology Shrewsbury, Mass.


  1. School of Wool Technology, University of New South Wales, Sydney

    • B. K. DAVIS


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