Medical Electron Microscopy

, Volume 28, Issue 3–4, pp 187–192 | Cite as

Dynamic changes in the microvascular architecture of rat hair follicles during the hair cycle

  • Shigeaki Sakita
  • Osamu Ohtani
  • Masaaki Morohashi
Article
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Abstract

We examined dynamic changes in the microvascular architecture of rat hair follicles during the hair cycle by scanning electron microscopy. Anagen hair follicles were surrounded by dense networks of capillaries at their lower parts. Below the tips of telogen hair follicles, there were collapsed networks of capillaries. Transmission electron microscopy showed that the capillaries around the bulbar region of anagen hair follicles possessed many fenestrations, while those of the collapsed networks located below the tips of telogen hair follices possessed virtually no fenestrations. Our results indicate that the dense network of capillaries around the lower part of the anagen hair follicle collapses with the involution of the follicle during tologen, and in turn develops with a new follicular downgrowth to form the basket-like capillary network of the anagen follicle. We also found that trans-endothelial transport occured much more frequently through the capillaries around anagen hair follicles than through those around telogen follicles.

Key words

Microvascular architecture Hair follicle Transmission electron microscopy Scanning electron microscopy Hair cycle 
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Copyright information

© The Clinical Electron Microscopy Society of Japan 1995

Authors and Affiliations

  • Shigeaki Sakita
    • 1
  • Osamu Ohtani
    • 2
  • Masaaki Morohashi
    • 1
  1. 1.Department of Dermatology Faculty of MedicineToyama Medical and Pharmaceutical UniversityToyamaJapan
  2. 2.Department of Anatomy, Faculty of MedicineToyama Medical and Pharmaceutical UniversityToyamaJapan

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