Hair Follicle, Functions, Diseases, A Simple Guide To The Condition, Diagnosis, Treatment And Related Conditions

By Kenneth Kee

This book describes Hair Follicle, Functions, Diseases, Diagnosis and Treatment and Related Diseases
A Hair Follicle comprises:
1.A root made of non-keratinized cell
2.A shaft made of keratinized material.
The shaft spreads from the skin surface to the free end of the hair.
The root and its lower end are termed the hair bulb and contain the hair matrix cells.
They comprise all the part below the skin surface and lies in what is called the hair follicle.
A pointed projection of the dermis protrudes into the hair bulb and is called the papilla.
It is richly supplied with the nerves and blood vessels.
It also contains the melanin which is accountable for the pigment in the dark hair.
The human body apart from areas of glabrous skin is covered in follicles which produce thick and fine hair.
Most frequent interest in hair is directed on hair growth, hair types and hair care.
Hair is also an important biomaterial mainly made of protein notably keratin.
Life and Death of a Hair Follicle:
My name is Hairy Man the hair follicle.
I was named Hairy Man by my friends who feel that I am a hairy character.
We are found every where on the body except for the palms, soles, dorsal aspect of the phalanges of the hands and feet, the penis, the labia minora and the lips.
I began as an epithelial bud on the outer surface of an embryo.
The epithelial bud appears as a hair follicle at about 9 weeks of age of the embryo’s life.
The first follicles develop in the areas that will eventually become the eyebrows, upper lip and chin.
My Hair follicle development on body, face and scalp then occurs in successive waves beginning at fetal age of 4 to 5 months.
I appear as a scalp hair follicle about this time.
The fully mature 9-month fetus normally has all of the hair follicles that will ever develop in that person.
Later on my friends the pigment cells responsible for hair pigment were told to make my hair shaft black by their pigmentation.
At the same time I incorporate a sebaceous oil gland that will supply lubrication for my hair shaft.
Normally my hair shaft will grow the follicle will grow out at an angle relative to the skin.
Attached to me is a tiny bundle of muscle fiber called the arrector pili.
This muscle is responsible for causing the follicle to become more perpendicular to the surface of the skin, and causing my follicle to protrude slightly above the surrounding skin.
This process results in goose bumps.
Next to us are the apocrine sweat glands which produce sweat to cool the body by evaporation.
We hairs protect the skin against harmful influences.
My friends the eyebrows direct sweat away from the eyes and the nasal hairs filter the air.
We the scalp hairs and my friend the body hairs also act as a thermal regulator keeping the body and head warm.
At the same time we hairs also keep the body cool by promoting sweat evaporation.
We hairs are also the sensitive tactile organ.
We scalp hairs also provides sexual attraction.
The cycle of my hair length varies on different parts of the body.
For my friends the eyebrows, the cycle is completed in around 4 months
For me at the scalp, the cycle takes about 2–7 years to finish
DLX3 is a crucial regulator of hair follicle differentiation and cycling.
1.Anagen phase (growth) 2 – 7 years
During this phase my hair shaft grows about 1cm every 28 days
At the end of the anagen phase an unknown signal causes my follicle to enter the catagen phase.
2.Catagen phase (regressive apoptosis) 2 -3 weeks:
A club hair is formed during the catagen phase
3.Telogen phase (dropping) 3 months
The telogen phase is my dropping phase
My hair shaft is beginning to fall from the scalp
50-100 of us are shed daily!
TABLE OF CONTENT
Introduction
Chapter 1 Hair Follicle
Chapter 2 Growth of A Hair Follicle
Chapter 3 Fu

• Language: English
• Publisher: Kenneth Kee
• Release date: Dec 25, 2018
• ISBN: 9780463701683

Kenneth Kee

Medical doctor since 1972.Started Kee Clinic in 1974 at 15 Holland Dr #03-102, relocated to 36 Holland Dr #01-10 in 2009.Did my M.Sc (Health Management ) in 1991 and Ph.D (Healthcare Administration) in 1993.Dr Kenneth Kee is still working as a family doctor at the age of 74However he has reduced his consultation hours to 3 hours in the morning and 2 hours inthe afternoon.He first started writing free blogs on medical disorders seen in the clinic in 2007 on http://kennethkee.blogspot.com.His purpose in writing these simple guides was for the health education of his patients which is also his dissertation for his Ph.D (Healthcare Administration). He then wrote an autobiography account of his journey as a medical student to family doctor on his other blog http://afamilydoctorstale.blogspot.comThis autobiography account “A Family Doctor’s Tale” was combined with his early “A Simple Guide to Medical Disorders” into a new Wordpress Blog “A Family Doctor’s Tale” on http://ken-med.com.From which many free articles from the blog was taken and put together into 1000 eBooks.He apologized for typos and spelling mistakes in his earlier books.He will endeavor to improve the writing in futures.Some people have complained that the simple guides are too simple.For their information they are made simple in order to educate the patients.The later books go into more details of medical disorders.He has published 1000 eBooks on various subjects on health, 1 autobiography of his medical journey, another on the autobiography of a Cancer survivor, 2 children stories and one how to study for his nephew and grand-daughter.The purpose of these simple guides is to educate patient on health disorders and not meant as textbooks.He does not do any night duty since 2000 ever since Dr Tan had his second stroke.His clinic is now relocated to the Buona Vista Community Centre.The 2 units of his original clinic are being demolished to make way for a new Shopping Mall.He is now doing some blogging and internet surfing (bulletin boards since the 1980's) startingwith the Apple computer and going to PC.The entire PC is upgraded by himself from XT to the present Pentium duo core.The present Intel i7 CPU is out of reach at the moment because the CPU is still expensive.He is also into DIY changing his own toilet cistern and other electric appliance.His hunger for knowledge has not abated and he is a lifelong learner.The children have all grown up and there are 2 grandchildren who are even more technically advanced than the grandfather where mobile phones are concerned.This book is taken from some of the many articles in his blog (now with 740 posts) A Family Doctor’s Tale.Dr Kee is the author of:"A Family Doctor's Tale""Life Lessons Learned From The Study And Practice Of Medicine""Case Notes From A Family Doctor"

Book preview

Hair Follicle, Functions,

Diseases,

A

Simple

Guide

To

The Condition,

Diagnosis,

Treatment

And

Related Conditions

By

Dr Kenneth Kee

M.B.,B.S. (Singapore)

Ph.D (Healthcare Administration)

Copyright Kenneth Kee 2018 Smashwords Edition

Published by Kenneth Kee at Smashwords.com

Dedication

This book is dedicated

To my wife Dorothy

And my children

Carolyn, Grace

And Kelvin

This book describes Hair Follicle, Functions, Diseases, Diagnosis and Treatment and Related Diseases which is seen in some of my patients in my Family Clinic.

(What You Need to Treat Hair Follicle, Functions, Diseases)

This eBook is licensed for your personal enjoyment only. This eBook may not be re-sold or given away to other people. If you would like to share this book with another person, please purchase an additional copy for each reader.

If you’re reading this book and did not purchase it, or it was not purchased for your use only, then please return to Smashwords.com and purchase your own copy.

Thank you for respecting the hard work of this author.

Introduction

I have been writing medical articles for my blog: http://kennethkee.blogspot.com (A Simple Guide to Medical Disorder) for the benefit of my patients since 2007.

My purpose in writing these simple guides was for the health education of my patients.

Health Education was also my dissertation for my Ph.D (Healthcare Administration).

I then wrote an autobiolographical account of his journey as a medical student to family doctor on his other blog: http://afamilydoctorstale.blogspot.com.

This autobiolographical account A Family Doctor’s Tale was combined with my early A Simple Guide to Medical Disorders into a new Wordpress Blog A Family Doctor’s Tale on http://kenkee481.wordpress.com.

From which many free articles from the blog was taken and put together into 800 eBooks.

Some people have complained that the simple guides are too simple.

For their information they are made simple in order to educate the patients.

The later books go into more details of medical disorders.

The first chapter is always from my earlier blogs which unfortunately tends to have typos and spelling mistakes.

Since 2013, I have tried to improve my spelling and writing.

As I tried to bring the patient the latest information about a disorder or illness by reading the latest journals both online and offline, I find that I am learning more and improving on my own medical knowledge in diagnosis and treatment for my patients.

Just by writing all these simple guides I find that I have learned a lot from your reviews (good or bad), criticism and advice.

I am sorry for the repetitions in these simple guides as the second chapters onwards have new information as compared to my first chapter taken from my blog.

I also find repetition definitely help me and maybe some readers to remember the facts in the books more easily.

I apologize if these repetitions are irritating to some readers.

Chapter 1

Hair Follicle

A Hair Follicle comprises:

1. A root made of non-keratinized cell

2. A shaft made of keratinized material.

The shaft spreads from the skin surface to the free end of the hair.

The root and its lower end are termed the hair bulb and contain the hair matrix cells.

They comprise all the part below the skin surface and lies in what is called the hair follicle.

A pointed projection of the dermis protrudes into the hair bulb and is called the papilla.

It is richly supplied with the nerves and blood vessels.

It also contains the melanin which is accountable for the pigment in the dark hair.

The human body apart from areas of glabrous skin is covered in follicles which produce thick and fine hair.

Most frequent interest in hair is directed on hair growth, hair types and hair care.

Hair is also an important biomaterial mainly made of protein notably keratin.

In many human societies women mainly grow the hair on their head long while men cut theirs short.

From Wikipedia

The word hair often indicates its 2 distinct parts:

1. The hair follicle beneath the skin or the hair bulb when pulled from the skin.

This organ is sited in the dermis and contains stem cells which not only re-grow the hair after it falls out but also are recruited to re-develop skin after a wound;

2. The hair shaft which is the long hard filamentous part that spreads above the skin surface.

A cross section of the hair shaft may be separated roughly into three zones.

Hair fibers have a structure comprising several layers.

Starting from the outside:

1. The cuticle which comprises several layers of flat, thin cells