Dermis From Wikipedia, the free encyclopedia
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This article is about the layer of skin. For the website, see DermIS (Dermatology Information System).
DermisLatindermis; coriumCodeTH H3.12.00.1.03001 A graphic representation of the interface between skin epithelium and the underlying connective tissue. Zone B, indicating the region of overlapping projections of epithelium and connective tissue, is the papillary dermis. Zone C, indicating the region of dermis that lies immediately subjacent to the interdigitations of epithelium, is the reticular dermis.
The dermis is a layer of skin between the epidermis (with which it makes up the cutis) and subcutaneous tissues, that consists of connective tissue and cushions the body from stress and strain. It is divided into two layers, the superficial area adjacent to the epidermis called the papillary region and a deep thicker area known as the reticular dermis.[1] The dermis is tightly connected to the epidermis through a basement membrane. Structural components of the dermis are collagen, elastic fibers, and extrafibrillar matrix (previously called ground substance).[2] It also contains Mechanoreceptors that provide the sense of touch and heat, hair follicles, sweat glands, sebaceous glands, apocrine glands, lymphatic vessels and blood vessels. Those blood vessels provide nourishment and waste removal for both dermal and epidermal cells.
Components of the DermisThe dermis is composed of three major types of cells[3]: Fibroblasts, Macrophages, and Adipocytes.Apart from these cells, the dermis is also composed of matrix components such as collagen (which provides strength), elastin (which provides elasticity), the epidermis, and glycosaminoglycans.[3]
LayersStratum papillareThe papillary region is composed of loose areolar connective tissue. This is named for its fingerlike projections called papillae, that extend toward the epidermis and contain either terminal networks of blood capillaries or tactile Meissner's corpuscles.[4] Stratum reticulareThe reticular region lies under the papillary region and is usually much thicker. It is composed of dense irregular connective tissue, and receives its name from the dense concentration of collagenous, elastic, and reticular fibers that weave throughout it. These protein fibers give the dermis its properties of strength, extensibility, and elasticity. Also located within the reticular region are the roots of the hair, sebaceous glands, sweat glands, receptors, nails, and blood vessels. Additional imagesEpidermis and dermis of human skin.
Cross-section of all human skin layers.
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The capillaries are contained within the dermis and and nutrients that the epidermis requires diffuses up to it.
2. The epidermis and the Dermis. The epidermis (outer layer of skin) has layer within it (5).
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Most visible skin problems can be seen on the epidermis, which is the outermost layer of the skin. Problems that are seen there can be caused by a problem within the deeper layers of the skin, the dermis and the subcutaneous layer of skin. The dermis is where most skin problems show? true or false?
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Within the dermis and subcutaneous layers there are different sensory receptors to detect sensations like temperature, pressure, heat, vibration etc.
There is 1 layer of skin, but the skin itself is made up of 7 different layers on a microscopic level. Each layer has a different function. We normally only talk about the 3 main layers within the skin - the epidermis, the dermis, and the subcutaneous tissue. The epidermis is however made up of 5 layers within itself, which gives you the total of 7.So it is far from the idea that you could peel of 6 layers of your skin and have a good layer underneath the same as you have currently on your body. You'd actually just be left with subcutaneous tissue which would be no good on its own at all.
Thermoreceptors
Chromatin material is contained within the nucleus.
It has DNA that is not contained within the nucleus.
Working from the outermost layer, the epidermis has no blood supply. The Dermis contains 2 main layers (plexi) of blood vessels, which can be referred to as the superficial dermal plexus and deep dermal plexus. More detail: The dermis can be split up into two layers, the papillary dermis and reticular dermis. One vascular plexus is situated in each. The superficial vascular plexus lies in the papillary dermis and is made mostly of capillaries. Capillary loops extend upwards towards (but not into) the epidermis and supply it with nutrients etc. The deep vascular plexus lies within the reticular dermis and is made mostly of venules, which drain the blood away from the skin back towards the heart. Larger vessels like veins and arteries are found in the subdermis a.k.a. subcutaneous layer and deeper (e.g. muscle).
Pores