Hair Follicle: Differentiation under the Electron Microscope - An Atlas

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Springer Science & Business Media, Dec 14, 2004 - Medical - 152 pages
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Each and every hair is much more than just the visible shaft—there are also associated complex sheath structures of epidermal and dermal origin. In the hair follicle, cells undergo a variety of differentiation processes, mostly depending on their layers and positions therein, and electron microscopy reveals a very complex architecture. The structure of a particular layer, such as Henle’s layer of the inner root sheath, is not uniform. Rather, cells drastically change during the course of differentiation. By simply comparing electron micrographs of cells of a layer at different degrees of differentiation, one can hardly recognize them as belonging to the same layer. As readers will see, this book contains many superb electron mic- graphs, from low-magni?cation panoramic views for orientation to hi- power views showing ultrastructural detail. Captions and schematic drawings are also very helpful in “reading” electron micrographs and - derstanding the structural detail. In this way, Dr. Morioka has succeeded in dissecting the complex hair follicle at the ultrastructural level.
 

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Contents

Introduction
1
Growth and Development
4
General Structure
9
Electron Microscopy
12
Life and Death
14
Materials and Methods
20
References
21
Medulla
25
Specifics of the Cuticle of the Inner Root Sheath
78
Relationship Between the Cuticle of the Inner Root Sheath and the Hair Cuticle
82
Alternative Ways of Hair Emergence
86
References
88
Outer Root Sheath and Companion Layer
89
Outer Root Sheath in the Hair Bulb
91
Boundary and Overlapping of the Outer Root Sheath and Companion Layer
93
Tonofilaments in the Companion Layer
96

Early Stages
26
Trichohyalin
28
Granules and Vesicles
34
Groove
36
Programmed Cell Death
40
References
43
Hair Cortex and Hair Cuticle
45
Accumulation of Keratin Fibers
48
Keratin Filament Bundles
50
Morphological Change of the Nucleus
54
Mitochondria
56
Keratinization of the Hair Cuticle
58
Granules
60
References
62
Inner Root Sheath
63
Precursors of the Inner Root Sheath
65
Formation of Trichohyalin Granules and Tonofilaments
67
Decomposition of Trichohyalin Granules and Cornification
70
Cellular Junctions
74
Degeneration of the Nucleus
76
General Characteristics of the Outer Root Sheath
97
Comparison with Fetal Epidermis
102
Final Fate
104
References
106
Hair Bulb and Papilla
107
Before Intrusion
110
First Intrusion Step in the Formation of the Papilla
114
Characteristics of the Dermal Papilla Cells
118
Hair Matrix
122
Recruitment and Evacuation of Stem Cells
125
References
128
Cells and Tissues That Surround the Hair Follicle
129
Dermal Muscle
132
Dermal Capillaries
137
Neurons and Related Cells
143
References
146
Keratins
147
References
149
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