Describe the layers of the epidermis and the cells contained in these layers.
Commenting on at least 2 of your peers’ responses. You can ask technical questions or respond generally to the overall experience. Be objective, clear, and concise. Always use constructive language, even in criticism, to work toward the goal of positive progress
Describe the layers of the epidermis and the cells contained in these layers
Peer # 1 Lori
The skin is our first line of defense against microorganisms. It makes up about 20 % of our body weight. Our skin has two layers, the epidermis is the outer most layer and the dermis is the innermost layer. The epidermis contains the sensory receptors for pain, temperature, touch, and vibration. It contains four basic types of cell, keratinocytes, melanocytes, merkell , and langerhan cells. The major cell type in the epidermis is Keratinocyte ( 95% ), which produce keratin : a scleroprotien that protects the skin from mechanical stress. Keratin is the substance of hair, nails, and skin. Pigment. The melanocytes secrete melanin, which creates the pigment in our skin. It also protects us form UV radiation. The langerhan cells migrate to the epidermis from the bone marrow to initiate our immune response by producing antigen to our T cells.” Merkell cells are associated with touch receptors and function as slowly adapting mechanoreceptors when stimulated by deformation of the epidermis.” (McCance, Huether, Brashers, & Rote, 2010, p. 1645)
The epidermis has five layers, with the basement membrane separating the epidermis and the dermis. As the cells migrate upward thru thr layers they chage shape from the round cells in the basal layer to the keratined cells on the surface. The life span of these cells is about 30 days.
The Stratum Basale ( germinativum) is above the basement membrane, this is where the keratinocytes are produced, by the basal cells. it also contains melanocytes, and merkel cells. .
The Stratum spinosum contains the keratinocytes and langerhahn cells .
The Stratum granulsum- this is where the kerationcytes lose their nucleus and ceates a glanualr appearance.
Stratum lucidium-this layer contains eleidin which beames ketanized as it makes it’s way forward.