Hair Care - DermaAmin

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Further works on the development of the hair follicle continued with Sengel (1976), 6 and Spearman (1977). 7,8 From this discussion, it should be apparent that hair research is a relatively modern interest, even though concerns about hair growth and loss date back to antiquity. The hair follicle number that is present at birth remains constant throughout youth, slowly decreasing with age. Hair follicles are formed early in development of the fetus with eyebrow, upper lip, and chin follicles present at week 9 and the full complement of follicles present by week 22 (Figure 1.2). At this time, the total body number of 5 million follicles is present with 1 million on the head, of which 100,000 are on the scalp. 9 No additional follicles are formed during life. As body size increases, the number of hair follicles per unit area decreases. This gradual decrease is demonstrated in Table 1.1. 10 The hair grows from follicles, which resemble stocking-like invaginations of the epithelium enclosing an area of dermis, known as the dermal papillae. The area of active cell division, the living area of the hair, is formed around the dermal papillae and is known as the bulb where cell division occurs every 23–72 hours. 11 The follicles slope into Table 1.1 Scalp hair density variation with age Age Scalp hair density (per square centimeter) Newborn 1135 One year 795 30 years 615 Hair care 2 the dermis at varying angles, depending on body location and individual variation, and reside at varying levels between the lower dermis and the subcutaneous fat. In general, larger hairs have more deeply placed follicles than finer hairs. 12 An arrector pili muscle attaches to the midsection of the follicle wall and ends at the junction between the epidermis and dermis. In some body areas, a sebaceous gland and an apocrine gland attach above the muscle and open into the follicle. The point at which the arrector pili muscle attaches is known as the hair ‘bulge’ and is considered to be the site where new matrix cells are formed and the hair growth cycle is initiated (Figure 1.3). It takes approximately 3 weeks for a newly formed hair to appear at the scalp surface.
Figure 1.2 Hair physiology 3 The appearance of the entire hair extracted intact from the follicle. Figure 1.3 The anatomy of the hair follicle in the skin. The sebaceous gland is intimately associated with each and every hair shaft. Sebum is important to the maintenance of the grown hair shaft, as it functions as a natural conditioning agent removing static electricity and imparting shine to newly grown hair. Approximately 400–900 sebaceous glands per square centimeter are located on the scalp and represent the largest glands on the body. 13 Sebum, composed of free fatty acids and neutral fats, is produced in increased amounts after puberty in males and females and abundantly coats the hair shaft in youth. With advancing age, sebum production declines in the female with a less significant decrease in males. This leads us to the next topic of discussion, which is the hair growth cycle.
Page 2: Hair Care
Page 5 and 6: © 2005 Taylor & Francis, an imprin
Page 8: Foreword Patients expect their derm
Page 12 and 13: Contents Foreword vii Acknowledgeme
Page 15: 1 Hair physiology HAIR STRUCTURE AN
Page 19 and 20: Figure 1.4 Hair physiology 5 The ap
Page 21 and 22: Figure 1.6 The layers of the hair s
Page 23 and 24: Hair physiology 9 original length.
Page 25 and 26: Hair physiology 11 Figure 1.13 Afri
Page 27 and 28: Hair physiology 13 are short. These
Page 29 and 30: Hair physiology 15 Blond 140,000 Br
Page 31 and 32: Hair physiology 17 a club-shaped pr
Page 33 and 34: Hair physiology 19 rapid fluctuatio
Page 35 and 36: Hair physiology 21 1. Trichorrhexis
Page 37: Hair physiology 23 42. Olsen EA, De
Page 40 and 41: Hair care 26 (b) Shampoo is foamed
Page 42 and 43: Figure 2.2 Hair care 28 Proper Sham
Page 44 and 45: Shampoos function by employing dete
Page 46 and 47: Hair care 32 The laureth sulfates a
Page 48 and 49: Hair care 34 film can also form on
Page 50 and 51: Normal hair shampoos are designed t
Page 52 and 53: Hair care 38 Baby shampoos are noni
Page 54 and 55: Hair care 40 shampoo-induced allerg
Page 56 and 57: Hair care 42 Improved flexibility L
Page 58 and 59: • Lipids • Quaternaries • Pol
Page 60 and 61: Hair care 46 more protein that will
Page 62 and 63: Figure 2.8 Hair care 48 A hot oil t
Page 64 and 65: Hair care 50 HAIR DRYING We have di
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Figure 2.11 Hand-held hairdryer tec
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Figure 2.15 Hair care 54 Round brus
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Figure 2.19 Detangling comb. Figure
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Hair care 58 both fracture the hair
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Figure 2.27 Stiff bristle brushes f
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Figure 2.30 A variety of hair-cutti
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Figure 2.36 Hair care 64 Razor blad
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Hair care 66 (b) Hair held tightly
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(d) Bangs are cut with hair twisted
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Hair care 70
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Hair care 72 Black individuals with
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Hair care 74 Nonelectric styling im
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Hair care 76 more hair breakage as
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Figure 2.50 Smooth rollers. Figure
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of hydrogen bonds and salt linkages
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Figure 2.57 Hair care 82 An example
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Hair care 84 34. Okamoto M, Yakawa
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Hair care 86 95. Slepyan AH. Tracti
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Hairstyling gel Clear gel polymer R
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Figure 3.4 Hair care 90 An electron
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Figure 3.6 Hair care 92 An electron
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Hair care 94 An example of a commer
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Hair care 96 OIL SHEEN SPRAY Hairsp
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Hair care 98 18. Plewig G, Fulton J
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Hair care 100 Tremendous color vari
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Figure 4.3 Hair care 102 Pheomelani
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Semipermanent: vegetable Semiperman
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Hair care 106 effect in the recent
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Hair care 108 is dismayed with the
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Figure 4.10 Hair care 110 The appea
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Hair care 112 more resistant to sha
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Hair care 114 Chemistry Permanent h
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Hair care 116 Nevertheless, some dy
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Figure 4.15 Hair care 118 The compl
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Figure 4.22 Hair care 122 The hair
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Hair care 124 The blond permanent h
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Figure 4.29 The red permanent hair
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Hair care 128 The multicolored stra
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Figure 4.38 Hair care 130 Brown hai
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Two-step bleaching is actually a co
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Figure 4.41 A mild hair dye reactio
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Hair care 138 of eumelanin and pheo
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5 Permanent hair curling The idea o
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Permanent hair curling 143 2. Proce
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Permanent hair curling 145 Figure 5
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Permanent hair curling 147 mandrels
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Permanent hair curling 151 Once the
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Table 5.1 Permanent waving lotion i
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Permanent hair curling 157 companie
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Permanent hair curling 159 A tight
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produce the curl is known as the
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Permanent hair curling 163 Home per
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Permanent hair curling 165 has been
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Permanent hair curling 167 REFERENC
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6 Permanent hair straightening Hair
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sodium hydroxide. This prevents sca
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Permanent hair straightening 173 Mi
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Permanent hair straightening 175 4.
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Permanent hair straightening 177 Fi
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Permanent hair straightening 181 ha
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Panthenol Sodium PCA Cetearyl alcoh
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Permanent hair straightening 187 ma
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7 Cosmetic-induced hair loss Dermat
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Cosmetic-induced hair loss 191 Figu
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Cosmetic-induced hair loss 193 In a
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Cosmetic-induced hair loss 195 Figu
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Cosmetic-induced hair loss 197 The
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Cosmetic-induced hair loss 199 Hair
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8 Methods for camouflaging hair los
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ase Cascades Curled locks of hair o
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Methods for camouflaging hair loss
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shaving legs, axilla, groin Dry sha
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Hair care 228 difficulty achieving
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Hair care 230 2. Select a quality l
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Hair care 232 2. Be sure that the h
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Figure 9.5 Hair care 234 A male fac
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Hair care 236 laser hair removal, f
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Hair care 238 A variety of needle d
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10 Tips to maintain healthy hair Is
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Hair care 242 comb. For this reason
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Figure 10.4 Hair care 244 Freshly s
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Hair care 246 within the hair shaft
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Figure 10.7 Hair care 248 Use of a
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Hair care 250 In short, one of the
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Hair care 252 nonliving. (b) Patien
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12 Summary This text has pictoriall
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pomades 80-81 shampoos 34 bleaching
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glyceryl monothioglycolate 139 grad
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negroid hair see Black persons’ h
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sodium hydroxide in hair straighten
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Hair Care - DermaAmin

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