Duration of anagen, catagen and telogen phases of scalp hair life (see Comments section for definitions)

Range anagen 3 - 5 years: catagen brief: telogen 2 - 4 months
Organism Human Homo sapiens
Reference Wolfram LJ. Human hair: a unique physicochemical composite. J Am Acad Dermatol. 2003 Jun48(6 Suppl):S106-14. DOI: 10.1067/mjd.2003.276 p.S106 left column 2nd paragraphPubMed ID12789162
Comments P.S106 left column 2nd paragraph: "In the scalp, each hair grows steadily, approximately 1 cm per month [BNID 109909], and continuously for 3 to 5 years (anagen phase). Growth then stops and is followed by a brief transient stage (catagen) and a 2- to 4-month resting stage (telogen), during which old hair is shed. With the onset of the anagen stage, new hair starts to grow from the same follicle. The growth process functions independently in each follicle, therefore, hairs are not shed simultaneously as they are in many animals. At any given time, some hairs are growing, some are resting, and some are being shed."
Entered by Uri M
ID 114255