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The epidermis is the outermost layer of our skin. Is the Coronavirus Crisis Increasing America's Drug Overdoses? The dermis consists of a papillary and a reticular layer that serve to protect and cushion the body from stress and strain. When this layer is reached, the keratinocytes are secreting protein and lipid granules that serve as the skin’s waterproof barrier. It contains no blood supply of its own—which is why you can shave your skin and not cause any bleeding despite losing many cells in the process. Superficial blood vessels lie beneath the lining cells. Another critical factor, exposure to sunlight, triggers the production of melanin as well. Will 5G Impact Our Cell Phone Plans (or Our Health?! The stratum basale (also called the stratum germinativum) is the deepest epidermal layer and attaches the epidermis to the basal lamina, below which lie the layers of the dermis. Histologically, the stratum basale is a single layer of cuboidal keratinocytes that directly abut and attach to the dermis. These include: http://en.wiktionary.org/wiki/integumentary_system, http://upload.wikimedia.org/wikipedia/commons/3/36/Skin_layers.png, http://en.wikipedia.org/wiki/stratum%20germinativum, http://en.wikipedia.org/wiki/Epidermis_(skin), http://en.wikipedia.org/wiki/keratinocyte, http://en.wikibooks.org/wiki/Human_Physiology/Integumentary_System%23Skin, http://en.wikipedia.org/wiki/Merkel%20cells, http://en.wikipedia.org/wiki/Vitamin_D%23Production_in_the_skin, http://en.wiktionary.org/wiki/connective_tissue, http://en.wikipedia.org/wiki/basement%20membrane, http://en.wiktionary.org/wiki/mechanoreceptor, http://en.wiktionary.org/wiki/pigmentation, http://en.wiktionary.org/wiki/stratum_corneum, http://commons.wikimedia.org/wiki/File:Skin_tanning.JPG, http://en.wikipedia.org/wiki/File:Illu_skin02.jpg. The sebaceous glands found in the dermis secrete a substance called sebum that helps to lubricate and protect our skin from drying out. It is the layer that’s closest to the blood supply lying underneath the epidermis. The bottom layer of the epidermis is called the stratum basale. The transfer of melanin from melanocytes to keratinocytes occurs thanks to the long tentacles each melanocyte extends to upwards of 40 keratinocytes. This is the layer where part of keratin production occurs. The daughter cells move into the outer layers of the epidermis and are ultimately shed as dead horny cells. epidermis is composed of.. stratified squamous epithelium. Haut und Hautanhangsgebilde, Their name is derived from two parts: melano-, which means black or darkness, and -cyte, which means cell. Um diesen Artikel zu kommentieren, melde Dich bitte an. The main layers of the epidermis are: stratum corneum, stratum lucidium, stratum granulosm, stratum spinosum, stratum germinativum (also called stratum basale). It is the keratinocytes which undergo this mitosis, producing two daughter cells, one of which remains in the basale and the other migrates and matures to the surface progressing through the layers in a process which takes up to 28 days . Gewebeschicht. Melanocyte: Cross-section of skin showing melanin in melanocytes. cell division to produce new keratinocytes. Klicke hier, um einen neuen Artikel im DocCheck Flexikon anzulegen. Skin color is determined largely by the amount of melanin pigment produced by melanocytes in the skin. Histologie. Additionally, the body will turn to this fat in times of starvation to provide power to its various processes, especially brain function. Fat, in particular, helps insulate our body from the cold and act as a cushion for our internal structures (such as muscles and organs) when something hits us. Synonym (s): stratum basale epidermidis. Conversely, light-skinned individuals (compared to dark-skinned ones) may have a rosy effect to their skin thanks to the relatively more oxygen-rich hemoglobin flowing through the blood vessels of their dermis. The reticular layer serves to strengthen the skin and also provides our skin with elasticity. Human Skin: This image details the parts of the integumentary system. Of Solving Crossword Puzzles, Racist Phrases to Remove from your Mental Lexicon keratin-thick cells the... Song Atin Cu Pung Singsing und wieder abgebaut wird pink tint to the blood vessels also allow immune cells... Appearance it gives off under a microscope shape, nuclear, and vessels. Hair roots, sebaceous glands found in the dermis and contains a protective waterproof barrier your Britannica newsletter to trusted... 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