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Related Concept Videos

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...
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...
Assessing Body Temperature - Tympanic membrane01:14

Assessing Body Temperature - Tympanic membrane

Assessing tympanic membrane temperature involves using a tympanic membrane thermometer (TMT). Here is a step-by-step guide:
Step 1: Begin by practicing good hand hygiene to prevent the transmission of microorganisms.
Step 2: Turn on the thermometer and wait until the ready sign appears on the screen to ensure accurate measurement.
Step 3: Slide the probe cover in place to prevent cross-contamination.
Step 4: Instruct the patient to tilt their head to the side for comfort and check for cerumen...
Assessing Body Temperature - Temporal Artery01:19

Assessing Body Temperature - Temporal Artery

Here is a stepwise guide to assessing the body temperature at the temporal artery using a temporal artery thermometer
Step 1: Perform hand hygiene and don a fresh pair of gloves to prevent cross-infection and ensure patient safety.
Step 2: Explain the procedure to the patient to establish trust. Clear communication establishes trust with the patient, ensures they understand what to expect, promotes cooperation, and enhances comfort during the procedure.  
Step 3: Assess the patient's forehead...
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.

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Related Experiment Video

Updated: May 9, 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

Hair and scalp evaluation: the trichogram.

C Serrano-Falcón1, M A Fernández-Pugnaire, S Serrano-Ortega

  • 1Servicio de Dermatología, Hospital de Guadix, EPHPO, Granada, España.

Actas Dermo-Sifiliograficas
|July 23, 2013
PubMed
Summary
This summary is machine-generated.

This guide details hair and scalp evaluation methods, categorizing them into noninvasive, semi-invasive (trichogram), and invasive (biopsy) techniques for clinical practice.

Keywords:
ExaminationExploraciónTrichologyTrichoscopyTricogramTricogramaTricologíaTricoscopia

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Last Updated: May 9, 2026

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Area of Science:

  • Dermatology
  • Trichology

Background:

  • Accurate hair and scalp condition assessment is crucial for effective diagnosis and treatment.
  • A structured approach to evaluation aids clinicians in differentiating various dermatological conditions affecting the hair and scalp.

Purpose of the Study:

  • To provide a practical guide for evaluating hair and scalp conditions in a dermatology setting.
  • To categorize and explain various diagnostic techniques used in trichology.

Main Methods:

  • Classification of techniques into noninvasive, semi-invasive, and invasive methods.
  • Description of common noninvasive techniques: clinical history, general examination, inspection, palpation, photography, and dermoscopy.
  • Explanation of semi-invasive (trichogram) and invasive (biopsy) methods.

Main Results:

  • Noninvasive methods offer a broad initial assessment.
  • The trichogram provides detailed follicular information.
  • Biopsy offers definitive histopathological diagnosis for complex cases.

Conclusions:

  • A tiered approach utilizing noninvasive, semi-invasive, and invasive techniques ensures comprehensive hair and scalp evaluation.
  • This practical guide empowers dermatologists to effectively diagnose and manage hair and scalp disorders.