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Apr 24, 2023 · The skin appendages are epidermal and dermal-derived components of the skin that include hair, nails, sweat glands, and sebaceous glands. Each component has a unique structure, function, and histology. This article describes the unique characteristics of each of these components and provides insight into tissue preparation for microscopic evaluation and the clinical significance of these ...
- Hani Yousef, Julia H. Miao, Mandy Alhajj, Talel Badri
- 2023/04/24
- 2020
- Epidermis
- Dermis
- Hypodermis
The epidermis is the most superficial layer of the skin, and is largely formed by layers of keratinocytes undergoing terminal maturation. This involves increased keratin production and migration toward the external surface, a process termed cornification. There are also several non-keratinocytecells that inhabit the epidermis: 1. Melanocytes – resp...
The dermis is immediately deep to the epidermis and is tightly connected to it through a highly-corrugated dermo-epidermal junction. The dermis has only two layers, which are less clearly defined than the layers of the epidermis. They are the superficial papillary layer, and the deeper reticular layer. The reticular layer is considerably thicker, a...
The hypodermis, or subcutaneous tissue, is immediately deep to the dermis. It is a major body store of adipose tissue, and as such can vary in size between individuals depending on the amount of fatty tissue present.
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Jul 31, 2023 · Histology of the skin appendages Author: Lorenzo Crumbie, MBBS, BSc • Reviewer: Uruj Zehra, MBBS, MPhil, PhD Last reviewed: July 31, 2023 Reading time: 25 minutes The largest organ in the body is the skin. It forms the bulk of the integumentary system. The skin is the site of numerous biochemical processes as it carries out a myriad of functions.
Aug 21, 2023 · mesoderm. , is the innermost layer of the skin and is mainly composed of fat and connective tissue. Skin appendages are derived from the skin and include hair, nails, and glands. The main functions of the skin are protection (barrier against ultraviolet radiation, microorganisms, and water loss), the synthesis of. vitamin D.
- Exocrine (holocrine) branched glands
Sep 16, 2024 · The nail bed is rich in blood vessels, making it appear pink, except at the base, where a thick layer of epithelium over the nail matrix forms a crescent-shaped region called the lunula (the “little moon”). Figure \(\PageIndex{7}\): Nails. The nail is an accessory structure of the integumentary system.
The epithelial cells become keratinocytes, producing high quantities of keratin, from which hair is composed. As the cells grow and divide, the older cells get pushed up and away from the blood supply they die. Their highly keratinized remains form the shaft of hair (along with melanocytes who have also dies and "joined for the ride!").
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Skin appendage. Skin appendages (or adnexa of skin) are anatomical skin-associated structures that serve a particular function including sensation, contractility, lubrication and heat loss in animals. In humans, some of the more common skin appendages are hairs (sensation, heat loss, filter for breathing, protection), arrector pilli (smooth ...
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