Related Experiment Videos
[Hair physiology].
1Service de Dermatologie, CHU Saint-Pierre, ULB, Bruxelles.
Revue Medicale De Bruxelles
|November 2, 2004
Summary
Human hair follicles develop early in fetal development, with scalp hair appearing later. Hair fibers grow in three distinct stages: anagen (growth), catagen (transition), and telogen (resting/shedding).
Area of Science:
- Dermatology and developmental biology.
- Histology and cell biology.
Context:
- Hair follicles are skin appendages crucial for hair fiber production.
- Follicle development begins early in intrauterine life, with scalp follicles appearing later.
- Hair fibers are primarily composed of keratin, an amino acid-rich protein.
Purpose:
- To describe the developmental timeline and structural characteristics of human hair follicles.
- To outline the distinct growth phases of hair fibers.
Summary:
- Hair follicles emerge on the body around the 8th week of gestation, with scalp follicles developing by the 7th month.
- Hair fibers, composed of keratin, grow from follicles extending through skin layers.
- Hair growth occurs in three stages: anagen (3-5 years), catagen (weeks), and telogen (2 months).
Impact:
- Provides foundational knowledge on hair follicle development and hair cycle biology.
- Contributes to understanding skin appendage formation and hair fiber dynamics.
- Informs research in dermatology, trichology, and regenerative medicine related to hair.