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Related Experiment Videos

Multiunit arrector pili muscular structure as a variation observed by using computer-based three-dimensional

Wu-Chul Song1, Kyung-Seok Hu, Ki-Seok Koh

  • 1Department of Anatomy, College of Medicine, Konkuk University, 322 Danwol-dong, Chungju, Chungbuk 380-701, South Korea.

Cell and Tissue Research
|July 8, 2005
PubMed
Summary

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The arrector pili (AP) muscle may connect to multiple hair follicles within a follicular unit (FU). Researchers found variations, including AP muscular units spanning across two or more FUs in human scalp specimens.

Area of Science:

  • Anatomy
  • Dermatology
  • Histology

Background:

  • The arrector pili (AP) muscle's anatomical relationship with hair follicles is crucial for piloerection.
  • Recent hypotheses suggest a single AP muscular unit serves all hair follicles within a follicular unit (FU).

Purpose of the Study:

  • To investigate variations in AP muscular units associated with FUs.
  • To determine if AP muscular units exhibit multi-unit structures within human scalp anatomy.

Main Methods:

  • Human cadaver scalp skin specimens were utilized.
  • Serial sectioning and Masson's trichrome staining were performed.
  • Three-dimensional reconstructions from sectioned images were analyzed via computer.

Main Results:

Related Experiment Videos

  • Two types of variations in AP muscular units were identified within 20 FUs.
  • A multiunit AP muscular structure was observed, where a single AP muscular unit connected to two or more FUs.

Conclusions:

  • The study identified variations in the anatomical arrangement of AP muscular units.
  • Evidence suggests that AP muscular units can be multiunit, associating with multiple FUs, challenging previous assumptions.