Name the different layers of the skin on the image and try to identify structures within the skin. See the image in included in the article.Which sublayer gives skin its strength and ability to stretch?.What role does keratin play in the skin and where can keratin be found?.What types of tissues are found in skin? Which skin layers have which tissues?.What are the five major functions of the skin?.Check back to the relevant parts of the article for the answers. Read the article then try to answer the questions. The hypodermis connects the skin to the body, stores fat, provides temperature insulation and cushions the internal structures from outside bumps and blows. The hypodermis is a fatty layer of connective tissue underneath the dermis, also called the superficial fascia and the subcutaneous layer. The reticular layer makes up the majority of the dermis, containing thickly interlaced collagen and elastic fibers which give the skin its strength and ability to stretch. Underneath the dermal papillae are dermal ridges that influence the shape of the epidermal layer, creating the varied skin patterns which make up fingerprints. Dermal papillae are finger-like projections that increase the surface area of the top layer of the dermis, facilitating the diffusion of nutrients, gasses, and wastes from the dermis to the epidermis. The papillary layer, the upper layer of the dermis, contains dermal papillae. white blood cells (involved in immunity).mast cells (involved in the histamine response).Small muscles in the dermis called arrector pili, cause the hairs in the skin to stand on end when you get cold or become frightened. Blood vessels in the dermis facilitate temperature regulation by constricting to channel blood to the core of the body, or widening to bring blood to the skin surface where it radiates heat away from the body. The dermis, a layer composed of connective tissue, lies underneath the epidermis. Under a light microscope, stratum lucidum appears as a thin translucent line separating the stratum corneum from the stratum granulosum. The stratum lucidum is a thin layer of dead keratinocytes only present in thick skin. Though these topmost skin cells are dead they are protective and contain waterproofing glycolipids. The stratum corneum is found in the uppermost layer of the skin and is much thicker in “thick skin,” the type of skin on your heels and palms. stratum basale (base of the epidermis containing melanocytes and tactile epithelial cells).stratum spinosum (contains dendritic cells which aid the immune response).stratum granulosum (lamellated granuales and keratohyalin granuales).stratum lucidum (thin (light) band in thick skin only).stratum corneum (tough outermost layer).dendritic cells (transport foreign substances to the lymph nodes).tactile epithelial cells (pick up sensory information).
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