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Research ArticleArticles

From the Literature: A new model for the morphology of the arrector pili muscle in the follicular unit based on three-dimensional reconstruction.

Francisco Jiménez-Acosta, WC Song, WJ Hwang, C Shin and KS Koh
Hair Transplant Forum International September 2006, 16 (5) 186; DOI: https://doi.org/10.33589/16.5.0186
Francisco Jiménez-Acosta
Las Palmas, Spain
MD
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WC Song
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WJ Hwang
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C Shin
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KS Koh
Department of Anatomy, College of Medicine, Konkuk University, Chungju, Republic of Korea.
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  1. Francisco Jiménez-Acosta, MD
    1. Las Palmas, Spain
  2. WC Song
  3. WJ Hwang
  4. C Shin
  5. KS Koh
    1. Department of Anatomy, College of Medicine, Konkuk University, Chungju, Republic of Korea.

Abstract

In the classic model of the arrector pili (AP) muscle, each hair follicle is independently associated with a single AP muscle. Recently, new models have been proposed based on interpretations of serial histological cross-sectional images. The purpose of this study was to confirm the morphology of the AP muscle in relation to the follicular unit (FU) using quantitative threedimensional (3D) reconstruction of serially sectioned images. Skin samples were obtained from the parietal region of the scalp, and processed using routine histological procedures. The serially sectioned slides were stained with Masson’s trichrome. All the hairs and hair follicles of the FU exhibited some degree of slanting, with the single AP muscle slanted in the same direction. The distal portion of the AP muscle was divided into branches, as in a bronchial tree. There was branching in the single AP muscle present in the FU, and it was inserted into all the hair follicles of the FU either tightly or loosely. We suggest that the classic anatomy of the AP muscle must be modified with this new model, now confirmed by computer-based 3D reconstruction.

  • Copyright © 2006 by The International Society of Hair Restoration Surgery
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International Society of Hair Restoration Surgery: 16 (5)
Hair Transplant Forum International
Vol. 16, Issue 5
September/October 2006
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From the Literature: A new model for the morphology of the arrector pili muscle in the follicular unit based on three-dimensional reconstruction.
Francisco Jiménez-Acosta, WC Song, WJ Hwang, C Shin, KS Koh
Hair Transplant Forum International Sep 2006, 16 (5) 186; DOI: 10.33589/16.5.0186

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From the Literature: A new model for the morphology of the arrector pili muscle in the follicular unit based on three-dimensional reconstruction.
Francisco Jiménez-Acosta, WC Song, WJ Hwang, C Shin, KS Koh
Hair Transplant Forum International Sep 2006, 16 (5) 186; DOI: 10.33589/16.5.0186
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