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 Dr. Lee is the founder and owner of Regrowth LLC, a company based in Los Angeles and dedicated to the treatment of hair loss. He has been developing innovative products and treating hair loss sufferers for the past 16 years. Dr. Lee is the creator of the Xandrox line of hair loss treatments.
Important Note: Due a busy schedule, Dr. Lee cannot answer any new questions at this time; however, he will be providing high quality answers to questions he receives from his own practice exclusively to Morphollica.com regularly
[name not provided]
2004-12-18
Hair shaft
Is the hair shaft diameter of terminal hair consistent throughout any
single anagen phase?
Not exactly. The hair shaft diameters and cross sectional areas have
been shown to change with distance from the scalp. The most dramatic
differences take place at the beginning of the anagen phase. Starting
from a very thin tip, the shaft size increases rapidly and reaches a
maximum thickness within 6-8 months. The hair shaft is not round in cross section. It is elliptical. In
straight black hair, the cross section is closer to being round. In
curly blond hair, the cross section is more elliptical. The scalp hairs
of persons of African descent have the most pronounced differences
between the major and minor axes of the cross sections of the hair
shaft. After the maximum thickness of the hair shaft has been reached during
the first 6 to 8 months of anagen, the major axis decreases
progressively, resulting in a 20% decrease in the cross-sectional area
and a decrease of 13% in ellipticity. In contrast, the minor axis of
the cross section of the hair remains constant throughout the anagen
phase.
Richard Lee, M.D.
Regrowth, LLC
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