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Related Concept Videos

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Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
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Hair and hair follicles are integral components of the integumentary system. Hair is a filamentous structure composed mainly of a protein called keratin. It is found on the surface of the skin throughout the body, except for areas such as the palms of the hands and soles of the feet.
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Related Experiment Video

Updated: Feb 10, 2026

Collecting Hair Samples for Hair Cortisol Analysis in African Americans
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Introduction to Hair Development.

Duane P Harland1

  • 1AgResearch Ltd., Lincoln, New Zealand. Duane.Harland@agresearch.co.nz.

Advances in Experimental Medicine and Biology
|May 26, 2018
PubMed
Summary

The anagen phase is crucial for hair growth, varying in duration from short periods for fine hairs to years for wool and scalp hair. This chapter details the internal structure and biological stages within the anagen hair follicle.

Area of Science:

  • Dermatology
  • Cell Biology
  • Mammalian Physiology

Background:

  • The hair follicle cycle is a complex biological process essential for mammalian hair growth.
  • The anagen phase, or growth phase, is a critical determinant of hair length and duration.
  • Variations in anagen phase duration exist across different hair types and species.

Purpose of the Study:

  • To elucidate the morphological and biological subdivisions within the anagen hair follicle.
  • To provide a detailed description of the anagen phase in various hair types.

Main Methods:

  • Histological examination of hair follicles.
  • Microscopic analysis of hair follicle structure.
  • Comparative study across different species and hair types.
Keywords:
Developmental zonesHair developmentHair follicleInner root sheathMorphology

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Main Results:

  • Identification of distinct morphological compartments within the anagen follicle.
  • Characterization of biological events occurring during the anagen phase.
  • Demonstration of conserved and divergent features of the anagen follicle.

Conclusions:

  • The anagen phase exhibits intricate structural and functional divisions.
  • Understanding these divisions is key to comprehending hair growth regulation.
  • This chapter provides a foundational description for further research into hair follicle biology.