What are the layers
The epidermis forms the interface between the human body and the environment. The epidermis is a classic proliferation tissue, i. H. it is subject to constant renewal.
The lowest layer of the epidermis is the basal cell layer (stratum basale = consists of one layer, the cells are cubic). This is where cells divide and regenerate cells. From here, the cells slowly migrate through further layers towards the surface of the skin. The transitions between the skin layers are fluid. The migration of cells from the basal cell layer to the surface takes about 28 days in healthy skin.
The first layer of cells that they reach is the prickly cell layer (stratum spinosum). Here (stratum spinosum = consists of many layers, the cells are spindle-shaped and flattened) the cells are connected with multiple “spike-like” intracellular bridges (desmosomes = tight rod-shaped connections, they are responsible for the mechanical stability of the skin). The appearance and connections of the cells give this layer its name. From here to the surface of the skin, the cells are surrounded by a “cell cement” or “cell mortar”, the extracellular lipid matrix. The extracellular lipid matrix consists mainly of lipids (fats) and proteins (proteins).
The next layer is the granule cell layer (Stratum granulosum = consists of one to several layers, the cells are clearly flattened). The granule cells contain hard protein bodies with a granular structure. In addition, “hard” fibrils develop (proteins = proteins - here collagen), which are responsible for the cross-linking of the keratin filaments. The cell nuclei degenerate and, together with the intracellular structures, are discharged into the extracellular matrix. This is where the conversion of living into dead keratinocytes (horn cells) takes place.
The outermost layer is the horny layer (stratum corneum = consists of approx. 120–150 layers, the cells are very flat). The lowest layer of this skin layer is the glossy layer (stratum lucidum) - it is characterized by a light-refracting effect. Here the cells are tightly packed. The layers are rich in fat and protein. In this way, they protect against water penetration and water loss from the depths (they contain: ceramides, cholesterol, cholesterol esters, fatty acids).
- Which superheroes had the least serious origins?
- Is 13 too late to grow
- Which morning routine do you feel great in?
- What is a Cyber Risk Assessment
- Why is nothing good enough for me?
- Australia has an obesity crisis
- Who is the best Shivaji or Akbar
- What was the worst prank
- What is Nairobi's zip code
- When will Tibet be part of India?
- How does fiber optic cable smell
- What's the charge on iodine
- Is Daenerys religioes
- Why does Cola make me happy?
- Are you ready to improve your career
- Celebrities read all of their Instagram comments
- Why are there no mosquitos in Disneyland?
- How important are the tests on Upwork
- The Kollywood Tamil Cinema falls back
- Is there anything that can cut iron
- If I am useless, then I am worthless
- What is the most valuable asset available
- What are some evergreen beautiful inspirational stories
- Why is the Sambhar lake salty
- 4x + 20 16 + 2x How do you find x
- Where can I recycle hangers?
- What are the particles of matter
- All veins carry deoxygenated blood
- What is the coelom of the earthworm
- Who invented cross country running?
- What virtues do millennials show
- Is religion something about a holy book
- How do you think about Facebook
- What are exercises that keep us focused