Structure: Deep part of skin; connective tissue composed of two layers. What connects the dermis to the epidermis? Its thickness varies depending on the location of the skin. Strat… In which layers does melanin deposit into keratinocytes, and how is this done? Start studying Learning Target: Describe the characteristics of the epidermis, dermis, and subcutaneous.. - Stellate-shaped antigen-presenting dendritic cells that arise from bone marrow (mesodermal origin). - Subcutaneous layer of superficial fascia that loosely binds skin to underlying tissues and organs. It is located beneath the epidermis and above the subcutaneous layer. Some characteristics of the epidermis include flexibility and several layers. It does not have any blood vessels within it (i.e., it is avascular). The dermis is made up of two inner layers namely – a thin upper layer called the papillary dermis, and a thick lower layer called the reticular dermis. Keratinocytes are the predominant cells in the epidermis, which are constantly generated in the basal lamina and go through maturation, differentiation, and migration to the surface. A) the epidermis of the skin has a rich supply of small blood vessels. The characteristics of the epidermis help it in playing its role. Learn vocabulary, terms, and more with flashcards ... Key Concepts: Terms in this set (50) finger-like processes that fold down from the epidermis into the dermis. The dermis has two regions: the Papillary Dermis and; the Reticular Dermis. C) fibroblasts in the dermis can give rise to new germinal cells in the epidermis. - Occurs within melanosomes that bud off the golgi. The dermis and hypodermis are the other layers of skin that lie below the epidermis. What is the most common cancer in the U.S., and what are the four major types? The Dermis • Is located between epidermis and subcutaneous layer • Anchors epidermal accessory structures (hair follicles, sweat glands) • Has 2 layers: – outer papillary layer – deep reticular layer Characteristics of Dermis Dense Irregular Connective Tissue Dermis layers Epidermis is the outermost layer and is about 0.05–1 mm in thickness depending on body part. The skin is composed of two main layers: the epidermis, made of closely packed epithelial cells, and the dermis, made of dense, irregular connective tissue that houses blood vessels, hair follicles, sweat glands, and other structures. - Pigments include melanin and carotene (also influenced by epidermal thickness and vascularization of dermis). The epidermis is highly keratinized, mostly dead, stratified squamous epithelium. There are two layers of epidermis, the living basal layer, which is next to the dermis, and the external stratum corneum, or horny layer, which is composed of dead, keratin-filled cells that have migrated outward from the basal layer. What is the largest organ of the body, what are the three layers of that organ, and which system is it a part of? What are the five layers of the Epidermis, as well as the underlying layer below the epidermis? Papillary layer. These vessels also help carry away waste products. What are the four stages of melanin synthesis, and where does it occur? - Several layers of large cuboidal or polygonal keratinocytes. To ensure the best experience, please update your browser. It is the layer that holds all the blood vessels, nerves, hair follicles, collagen and sweat glands. It looks like your browser needs an update. The epidermis is divided into 5 sub-layers, that have different functions. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Start studying Diseases of the dermis and dermal characteristics. - Epithelial cells enriched in keratin protein. See more. What are the important histological characteristics of the hypodermis? Quiz: What is Anatomy and Physiology? What is the dermis composed of, what does it contain, and what are its two layers? What are the key features of the epidermis, including what is it composed of, and the major and minor cell types? Underneath the epidermis lies the dermis. The epidermis does not consist of nerves whereas the dermis contains nerve impulses which pass through the brain. - 2 mitotic layers are the stratum spinosum, and stratum basale, - Increased proliferation of karatinocytes in stratum basale and spinosum (stimulated by activated T cells). These factors include smoking, alcohol, and excessive UV exposure, all of which contribute to the development of wrinkles, sunspots, and the uneven thickening or thinning of the skin. Dermis cover the significant portion of the skin’s layer. The dermis is the thickest layer of skin, and a fibrous structure composed of collagen, elastic tissue, and other extracellular components including vasculature, nerve endings, hair follicles, and glands. - Only apparent in thick skin (palms and soles). 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. Tyrosine (the enzyme tyrosinase) -> which becomes dopa -> dopaquinone -> following two pathways to yield phenomelanins, and eumelanins. The epidermis does not contain blood vessel whereas dermis contains capillaries beneath the epidermis. Start studying Dermis. Several cellsmake up the epidermis. 5 … Next The Dermis. 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