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

Journal of Anatomy
Wu-Chul SongKi-Seok Koh

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 three-dimensional (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.

References

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Citations

Oct 18, 2012·Journal of Huazhong University of Science and Technology. Medical Sciences = Hua Zhong Ke Ji Da Xue Xue Bao. Yi Xue Ying De Wen Ban = Huazhong Keji Daxue Xuebao. Yixue Yingdewen Ban·Xiong WangTiechi Lei
Apr 25, 2012·Anatomical Science International·Jeong-Nam KimWu-Chul Song
Sep 12, 2014·International Journal of Trichology·Niloufar TorkamaniRodney D Sinclair
Dec 13, 2006·Journal of Dermatological Science·Masahiro TajimaAkihiro Ishino
Mar 13, 2014·Biological Reviews of the Cambridge Philosophical Society·Joseph N Nissimov, Asit Baran Das Chaudhuri
Jul 31, 2016·Anatomical Science International·Niloufar TorkamaniRodney Sinclair
Jun 16, 2010·Experimental Dermatology·Jennifer E KloepperZoltán Cseresnyés
Mar 4, 2014·The British Journal of Dermatology·N TorkamaniR Sinclair
Jan 13, 2022·Skin Research and Technology : Official Journal of International Society for Bioengineering and the Skin (ISBS) [and] International Society for Digital Imaging of Skin (ISDIS) [and] International Society for Skin Imaging (ISSI)·Tomonobu EzureKyoichi Matsuzaki

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