Hair Follicle: Differentiation under the Electron Microscope - An AtlasEach 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. |
Contents
Life and Death | 14 |
Trichohyalin | 28 |
References | 43 |
3 | 45 |
Keratinization of the Hair Cuticle | 58 |
Cellular Junctions | 74 |
References | 88 |
Tonofilaments in the Companion Layer | 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 |
Other editions - View all
Hair Follicle: Differentiation under the Electron Microscope - An Atlas K. Morioka Limited preview - 2004 |
Hair Follicle: Differentiation under the Electron Microscope - An Atlas K. Morioka No preview available - 2010 |
Hair Follicle: Differentiation under the Electron Microscope - An Atlas K. Morioka No preview available - 2009 |
Common terms and phrases
adipocytes apoptosis arrows in Fig asterisks Bars boundary bundles cell death cell membrane cellular chromatin connective tissue follicle contrast cornification cortex cells Cp cells cuticle of inner cytoplasm day 14 rats day 7 rat degeneration denotes dermal cells dermal muscle dermal papilla dermis desmosomes dorsal skin dotted line electron microscopy epidermis epithelial exocuticle facial skin formation hair bulb hair cortex hair cuticle cells hair follicle hair growth hair matrix cells hair shaft Henle’s Henle's layer Huxley's layer Ihara immature inner root sheath intermediate filaments Invest Dermatol K6hf keratin fibers keratin filament layer cells lysosomes mammals maturation medulla medulla cells mitochondria Morioka morphological changes nucleus outer root sheath proteins root sheath cells root sheath IRS Samples were obtained sarcomere sebaceous gland shown in Fig skin of day stem cells Takano-Ohmuro terminal differentiation thick arrow thin tonofilaments trichohyalin granules vesicles Z band