Hair Follicle: Differentiation under the Electron Microscope - An Atlas

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Springer Science & Business Media, Mar 21, 2006 - 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

Life and Death
14
Trichohyalin
28
References
43
3
45
Morphological Change of the Nucleus
54
Granules
60
Formation of Trichohyalin Granules and Tonofilaments
67
Cellular Junctions
74
Inner Root Sheath
96
Comparison with Fetal Epidermis
102
Before Intrusion
110
Characteristics of the Dermal Papilla Cells
118
Recruitment and Evacuation of Stem Cells
125
Dermal Muscle
132
Neurons and Related Cells
141
References
147

Relationship Between the Cuticle of the Inner Root Sheath and the Hair Cuticle
82
References
88

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