cutis, skin, tegument - a natural protective body covering and site of the sense of touch; "your skin is the largest organ of your body". It coordinates with different organ systems in the body and contributes to maintaining the internal environment of the body (homeostasis). (2017, March 19). The acinus of each gland converges toward a common excretory duct. The skin can also be subjected to genetic disorders like psoriasis or albinism. It separates as well as communicates the inner body with the outer surroundings. This article will discuss all of these components in detail together with some clinical notes about them and the integumentary system as … Sweat allows the body to cool down. This is caused when the sebaceous glands (in hair follicles) become blocked and then infected, leading to inflammation and pustule formation. The final hair product that is exposed on the surface of the skin will be composed entirely of keratin. Hair, feather, scales, nails and horns are examples of exoskeleton or integumentary (because some Stack Exchange Network Stack Exchange network consists of 176 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to … integumentary synonyms, integumentary pronunciation, integumentary translation, English dictionary definition of integumentary. The nail plate is the exposed part that has grown out from the nail bed. The integument as an organ: The integument as an organ, and is an alternative name for skin. Definition. The hair is formed by the division of cells of the bulb, and they become keratinized when the old cells are push upwards, away from their source of nutrition. Fungal infections include athletes foot, yeast infections and ringworm infections. Regions of the Skin: Definition. Mammary glands are, structurally, tear-shaped, and are composed of glandular tissue, fibrous tissue, fatty tissue, and blood supply. While acne only causes mild discomfort, at the other end of the spectrum are diseases like necrotizing fasciitis, which can be deadly even with appropriate treatment. It is the outer layer of skin that has no blood vessels supply, and the cells in the squamous epithelium receive blood via diffusion. Image Source: Wikipedia. 2. The skin is a sensory organ, too, with receptors for detecting heat and cold, touch, pressure, and pain. “Medical gallery of Blausen Medical 2014”, https://www.youtube.com/watch?v=i3W3f38ZpJo. 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Its cells actively divide and continually replace the worn-out cells of the cornified layer. Similarly, extended exposure to water during baths or during swimming, crinkles the skin since water is absorbed and retained in the epidermis. From each of these sinuses, a single duct arises that opens into the nipple. Telogen stage lasts for 2–3 months and approximately 10–15% of all hairs in the scalp are in this stage. Sebaceous glands are present in all parts of the body except the palms of the hands and the soles of the feet. ‘Cold sores’ arise from oral herpes, forming blisters around the mouth. Finally, prolonged exposure to UV rays can result in sunburns or even skin cancer, especially in people with low melanin content in their skin. The Integumentary System is the largest organ of the body and covers an area of about 2m sq in the human body. Rec., 288A: 877-884. Ninth Edition. Layers of tightly bound, heavily keratinized, anucleated cells provide the first line of defense by forming a physical barrier. The integumentary system includes the skin and the skin derivatives hair, nails, and glands. On the other hand, goosebumps arising from the contraction of arrector pili muscles can keep the body warm, especially in hairy mammals. The accumulation of melanin results in the darkening of the skin. ‘Hand lotions can provide a therapeutic measure, preventing dehydration, desquamation, loss of skin lipids, and damage to the integumentary system.’ ‘Severe hand irritation was defined as one or more full-thickness cracks or other integumentary breaks on the hands' surfaces.’ ‘As a result, their integumentary system may be compromised.’ Covers entire surface of the body. The Journal of Periodontology, 31: 346-355. DOI: Hoover E, Alhajj M, Flores JL. The skin is a minor excretory organ for some substances, especially when kidney function is impaired and aromatic substances, e.g. Integumentary system. The integument is the body’s largest organ and accounts for 15% of body weight. Catagen lasts approximately two weeks in humans, and during this phase, the proximal part of the hair shaft becomes keratinized and forms the club hair. The root of the nail is embedded in the skin and covered by the cuticle, which forms the hemispherical pale area called the lunula. The epidermis is made of four layers – the stratum basale, stratum spinosum, stratum granulosum and stratum corneum. The melanocytes may ulcerate and bleed and are observed most commonly in young and middle-aged adults. “Integumentary System.” Biology Dictionary. There is no direct blood supply to the epidermis and therefore, the cells of this stratified squamous tissue obtain nutrients and oxygen through diffusion. 2. serving as a covering. 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