Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Hair Cells01:22

Hair Cells

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.
Somatosensation01:33

Somatosensation

The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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...
Dark Triad and Person Perception01:29

Dark Triad and Person Perception

Person perception is influenced by both external behaviors and the observer’s internal characteristics, including personality traits. Individuals with dark personality traits, comprising psychopathy, Machiavellianism, and narcissism — collectively known as the dark triad – exhibit manipulative and exploitative tendencies in social contexts. These traits affect how they perceive others and how they are perceived.The Role of Dark Personality Traits in Person PerceptionBlack et al. (2014) explored...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Two cases of papulo-pustular rosacea-like eruptions following COVID-19 vaccinations.

Journal of the European Academy of Dermatology and Venereology : JEADV·2021
Same author

Updates on lymphogranuloma venereum.

Journal of the European Academy of Dermatology and Venereology : JEADV·2021
Same author

Possible protective role of metformin therapy on colonic polyps in acromegaly: an exploratory cross-sectional study.

European journal of endocrinology·2021
Same author

SARS-CoV-2 infection: the same virus can cause different cutaneous manifestations.

The British journal of dermatology·2020
Same author

Knowledge of sexually transmitted infections and risky behaviors among undergraduate students in Tirana, Albania: comparison with Italian students.

Journal of preventive medicine and hygiene·2020
Same author

Common bacterial urogenital infections: a study on their aetiology and prevalence in a sexually transmitted infections centre.

Journal of the European Academy of Dermatology and Venereology : JEADV·2020
Same journal

Mpox Outbreaks Beyond Historically Endemic Regions: A Clinical Review of Vaccination Strategies and Public Health Challenges.

Dermatology (Basel, Switzerland)·2026
Same journal

Clinical Insights and Prognostic Factors in Frontal Fibrosing Alopecia and Lichen Planopilaris: A Retrospective Cohort Study.

Dermatology (Basel, Switzerland)·2026
Same journal

Descriptive Analysis of DRESS Reports from EudraVigilance and DRESS Cases from the RegiSCAR-project.

Dermatology (Basel, Switzerland)·2026
Same journal

The Role of the Vagus Nerve and Its Stimulation in Modulating Inflammatory Skin Diseases and Other Dermatologic Conditions: From Mechanisms to Therapeutics.

Dermatology (Basel, Switzerland)·2026
Same journal

Skin Barrier Dysfunction, Antimicrobial Peptide Alterations, and Microbiome Changes in Solid Cancer Patients Treated with Epidermal Growth Factor Receptor Inhibitors.

Dermatology (Basel, Switzerland)·2026
Same journal

PASI Training via Virtual Reality Application - new way of effective teaching.

Dermatology (Basel, Switzerland)·2026
See all related articles

Related Experiment Video

Updated: Jun 24, 2026

A New Technique for Quantitative Analysis of Hair Loss in Mice Using Grayscale Analysis
06:41

A New Technique for Quantitative Analysis of Hair Loss in Mice Using Grayscale Analysis

Published on: March 9, 2015

Perception of baldness and hair density.

F Vecchio1, M Guarrera, A Rebora

  • 1DiSEM, Section of Dermatology, University of Genoa, Italy.

Dermatology (Basel, Switzerland)
|February 9, 2002
PubMed
Summary
This summary is machine-generated.

The parietal/occipital hair density ratio is not a superior measure for assessing androgenetic alopecia severity compared to the Hamilton/Norwood scale. Early baldness perception involves hair shaft thinning, not just density reduction.

More Related Videos

Collecting Hair Samples for Hair Cortisol Analysis in African Americans
06:01

Collecting Hair Samples for Hair Cortisol Analysis in African Americans

Published on: June 10, 2018

Assessment of Midline Lingual Point-Pressure Somatosensation Using Von Frey Hair Monofilaments
06:31

Assessment of Midline Lingual Point-Pressure Somatosensation Using Von Frey Hair Monofilaments

Published on: February 21, 2020

Related Experiment Videos

Last Updated: Jun 24, 2026

A New Technique for Quantitative Analysis of Hair Loss in Mice Using Grayscale Analysis
06:41

A New Technique for Quantitative Analysis of Hair Loss in Mice Using Grayscale Analysis

Published on: March 9, 2015

Collecting Hair Samples for Hair Cortisol Analysis in African Americans
06:01

Collecting Hair Samples for Hair Cortisol Analysis in African Americans

Published on: June 10, 2018

Assessment of Midline Lingual Point-Pressure Somatosensation Using Von Frey Hair Monofilaments
06:31

Assessment of Midline Lingual Point-Pressure Somatosensation Using Von Frey Hair Monofilaments

Published on: February 21, 2020

Area of Science:

  • Dermatology
  • Trichology

Background:

  • Accurate assessment of androgenetic alopecia (male-pattern baldness) is crucial.
  • Existing scoring systems require precise and objective measures.

Purpose of the Study:

  • To evaluate the efficacy of the parietal/occipital hair density ratio as a measure of androgenetic alopecia severity.
  • To compare this ratio with the established Hamilton/Norwood scale.

Main Methods:

  • Studied 109 men, measuring hair density in 1-cm² areas on the vertex and occipital scalp.
  • Utilized videomicroscopy to count hairs within a standardized 30-mm² central section.
  • Calculated the ratio of hair density between the parietal and occipital areas.

Main Results:

  • Occipital hair density averaged 127 hairs/cm² across all Hamilton/Norwood classes.
  • Parietal hair density significantly decreased from 138 to 47 hairs/cm² in later stages.
  • The parietal/occipital ratio showed a significant decrease only in clinically apparent baldness stages (Hamilton/Norwood classes 4-6).

Conclusions:

  • The parietal/occipital hair density ratio is not a more effective measure of baldness severity than the Hamilton/Norwood scale.
  • Early perceptions of baldness are influenced by hair shaft thinning, not solely by reduced hair density.