Abstract
An understanding of the relationship between epidermis and dermis is probably the key to events in the normal and pathologic life of hair follicles. The ectodermal parts of the follicle are so closely and firmly attached to the mesodermal parts by way of the connective sheath and dermal papilla that a strong pull is needed to pluck a hair still attached to its papilla (Ludwig, 1969). Changes in the relative positions, sizes and shapes of the two elements are prerequisite to changes in follicular structure; thickening and wrinkling of the connective tissue sheath and of the glassy membrane are simultaneous with the beginning of catagen, i.e., with the formation of a club hair, the involution of the outer ectodermal sheath and the escape of the dermal papilla from its refuge in the bulbar cavity, all marks of the end of anagen. Conversely, the reentry of a papilla into the bulb always coincides with the beginning of anagen (Montagna and Parakkal, 1974; Kligman, 1959).
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© 1981 Springer-Verlag Berlin Heidelberg
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Moretti, G., Cardo, P., Moreno, V. (1981). Hair Follicles and Their Environment. In: Orfanos, C.E., Montagna, W., Stüttgen, G. (eds) Hair Research. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-81650-5_25
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DOI: https://doi.org/10.1007/978-3-642-81650-5_25
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