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1 sty 2023 · Rete ridges (RRs) are distinct undulating microstructures at the junction of the dermis and epidermis in the skin of humans and certain animals. This structure is essential for enhancing the mechanical characteristics of skin and preserving homeostasis.
- Rete Ridges
Rete ridges (RRs) are distinct undulating microstructures at...
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Skin is composed of two typical layers of dermis and...
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- Rete Ridges
1 sty 2023 · Rete ridges (RRs) are distinct undulating microstructures at the junction of the dermis and epidermis in the skin of humans and certain animals. This structure is essential for enhancing the mechanical characteristics of skin and preserving homeostasis.
The epidermis forms an undulating appearance, with intermittent regular protrusions of the epidermis layer (rete ridges or pegs) into the upper layers of the underlying dermis. In some areas of the body such as the palms and soles, the rete pegs are less pronounced.
During human skin development, specific interactions between epidermal and dermal cell lineages give rise to fully functional skin that contains specialized appendages, including hair follicles, sweat glands, and rete ridges.
Rete ridges surround the dermal papillae, which can be seen as small extensions protruding from the papillary dermis within the epidermis. These two structures are perfectly embedded; the alternation of a rete ridge with a dermal papilla creates a characteristic repetitive and wave-shaped pattern.
Skin reduces the amount of UV light that reaches underlying tissues in two ways. First, the thick layer of keratin and epithelia in the epidermis reduces the amount of UV light that reaches the dermis. Second, cells in the skin called melanocytes produce melanin which absorbs UV light.
6 maj 2023 · Structure. The normal epidermis can be broken down into five distinct layers: the stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum. The stratum basale contains the stem cells for keratinocytes that constantly regenerate and push keratinocytes further outwards.
