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Related Concept Videos

Multipotency and Niche of Bulge Stem Cell01:06

Multipotency and Niche of Bulge Stem Cell

A hair follicle or HF is a small part of the skin that produces the hair shaft. Paul Gerson Unna was the first to observe a bulge in the human hair follicle's outer root sheath (ORS). The bulge is present between the sebaceous gland and the arrector pili muscle and is the niche for hair follicle stem cells (HFSCs). The bulge is also a niche for melanocyte stem cells, and their loss results in graying of hair. The HFSCs express Sox9 and Lhx2, which help them maintain stemness and prevent...
Accessory Structures of the Skin: Hair and Hair Follicles01:16

Accessory Structures of the Skin: Hair and Hair Follicles

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.
Hair is a keratinous filament growing out of the epidermis. It is primarily made of dead, keratinized cells. Hair strands originate at the epidermal penetration called the hair follicle. The hair shaft is the part...
Accessory Structures of the Skin: Hair Growth and Types01:20

Accessory Structures of the Skin: Hair Growth and Types

Hair growth begins with the production of keratinocytes by the basal cells of the hair bulb. As new cells are deposited at the hair bulb, the hair shaft is pushed through the follicle toward the surface. Keratinization is completed as the cells are pushed to the skin surface to form the shaft of hair that is externally visible. The external hair is completely dead and composed entirely of keratin. Hair can be cut or shaven without damaging the hair structure because the cut is superficial. Most...

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Related Experiment Video

Updated: Jul 26, 2026

Rapid Genetic Analysis of Epithelial-Mesenchymal Signaling During Hair Regeneration
10:09

Rapid Genetic Analysis of Epithelial-Mesenchymal Signaling During Hair Regeneration

Published on: February 28, 2013

Creating a hairline.

M A Pomerantz1

  • 1Chicago Hair Institute, Hinsdale, Illinois, USA.

Dermatologic Clinics
|May 18, 1999
PubMed
Summary

Designing a natural frontal hairline is crucial for facial aesthetics and first impressions. Modern hair transplant techniques focus on precise hairline design for optimal surgical outcomes.

Area of Science:

  • * Aesthetic surgery
  • * Facial reconstructive surgery

Background:

  • * The frontal hairline is a key facial feature influencing perceived attractiveness.
  • * Michelangelo's facial proportions suggest hairline placement at the middle and upper facial thirds.
  • * Surgeons are primarily evaluated by the quality of the hairlines they create.

Purpose of the Study:

  • * To discuss modern hair grafting techniques.
  • * To explore principles of effective hairline design in hair transplantation.

Main Methods:

  • * Review of contemporary hair transplantation methodologies.
  • * Analysis of aesthetic principles for hairline creation.

Main Results:

  • * Modern techniques allow for precise and natural-looking hairline reconstruction.

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Rapid Genetic Analysis of Epithelial-Mesenchymal Signaling During Hair Regeneration
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Generation of Integration-free Human Induced Pluripotent Stem Cells Using Hair-derived Keratinocytes
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Generation of Integration-free Human Induced Pluripotent Stem Cells Using Hair-derived Keratinocytes

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Construction of a Realistic, Whole-Body, Three-Dimensional Equine Skeletal Model using Computed Tomography Data

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  • * Attention to hairline design significantly impacts patient satisfaction and surgical results.
  • Conclusions:

    • * Hairline design is paramount in hair transplant surgery.
    • * Advanced grafting techniques are essential for achieving aesthetically pleasing results.