The second layer, the dermis, gives the skin its strength and stops it from tearing easily. Renewal of the skin barrier through the unique process of exfoliation is described. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The adjective cutaneous means of the skin from latin cutis, skin. Skin is the general covering of the entire external surface of the body. Nov 26, 2012 layers of skin skin is composed of 3 layers 1 epidermis 2 dermis 3 hypodermis or subcutis 4. Pdf structure and function of skin, hair and nails. It is also a barrier against mechanical forces, both physical and chemical, which can be hostile to life from outside. The epidermis, or outer layer, has four or five distinct layers of cells table 1 and fig 1 but no blood vessels or nerve endings. Anything that interferes with skin function or causes changes in appearance see effects of aging on the skin can have major consequences for physical and mental health. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext.
Necrotizing skin infections are severe forms of cellulitis a spreading bacterial infection of the skin. All mammals have some hair on their skin, even marine mammals like whales, dolphins, and porpoises which appear to be hairless. How to find your skin type pick the most correct answer, then go back and see which letter either a, b, c, or d you choose most frequently. The scale structure typically displays a quasiperiodic pattern comprised of alternate rows of overlapping scales running over the length of the fish fig. Get a printable copy pdf file of the complete article 116k, or click on a page image below to browse page by page. A soft and smooth b dry in spots, but fine everywhere else c tight and dry all over. Supra basal spinous cells, for example, are polyhedral in shape and have a rounded nucleus, whereas cells of the upper. Course one describes the structure and function of the skin barrier, including its role in the bodys immune processes.
Skin of a different nature exists in amphibians, reptiles, and birds. Enter your mobile number or email address below and well send you a link to download the free kindle app. It is also the largest organ of the human body, providing around 10% of the body mass of. Structure and function of skin, hair and nails medicine. Then you can start reading kindle books on your smartphone, tablet, or. Humoral responses result in the generation of antibody reactive with a. This chapter presents the structure and the function of the skin. The layer below the dermis, the hypodermis, consists largely of fat. Thats why people with darker skin more melanin are at lower risk of skin. Most of the cells in the epidermis are keratinocytes. Melanin is a natural pigment that the skin produces when exposed to uvb radiation. The skin shelters and protects the entire physiochemical phenomenon necessary for life internally.
Anatomy and physiology of the skin 3 or stratum spinosum murphy, 1997. Palms and soles are the only regions without sebaceous glands. As such, it creates a barrier between the body and the external environment and protects the body against excessive. The structural architecture of skin and the important molecules that maintain this structure are also included in this course section. Skin structure objectives students will be able to name the layers of the skin, understand the structure of the skin, and be able to label it from the outer surface inward. This article comes with a selfassessment enabling you to test your knowledge after reading it. Jan 23, 2020 this article offers a compact overview of the body. The skin accounts for about 15% of the total body weight of an adult and has a surface area of about 2 m 2. This layer stores fuel and stops the body from losing too much heat. Understanding the structure and function of the skin.
Lss the skin alexandra burkesmith introduction to the skin. The structure and function of skin only 1 left in stock order soon. The squamous layer is composed of a variety of cells that differ in shape, structure, and subcellular properties depending on their location. Skin structure and function george rogers learning objectives this topic should provide you with.
Structure and function of the skinstratum corneum keratin is produced bythe epidermal cells asthey move upwardsfrom the basal layer protection, fluidconservation, uv 7. It is a protective covering for the skeletal system and vital organs. The skin is an organ that provides the outer protective wrapping for all the body parts. The skin is one of the most important organs of a human. Skin structure, layers and function understanding skin related products skin functions as the bodys first line of defence against bacteria and viruses, and is also a vital sensory organ, sensitive to the softest touch as well as pain. The editors overall aim is to teach skin biology in the context of practical settings. It is the largest organ of the body and it is covered by cutaneous membrane. The epidermis is the relatively thin, tough, outer layer of the skin. Skin diseases affect 2033% of the population at any one time. Many problems that appear on the skin are limited to the skin.
Skin functions, structure and relationship with the body. View skin problems such as sun burn, skin cancer and acne. Skin proliferation, sustenance of the skin, skin appendages hair and nails, skin color, diseases of the skin. Structure, function and medical terminology of the skin by. The skin protects us against the external environment. Beneath the surface of the skin are nerves, nerve endings, glands, hair follicles, and blood vessels. Structure and function of the skin wound care education. The primarily american authorship covers the structure and function of the skin in a systematic way, from gross anatomy down to molecular biology and genetics. It consists of two layers, the epidermis and the dermis, which work closely together. Skin care questions common skin complaints, treatments, hair removal techniques and more. Structure and functions of the skin see online here the skin forms part of the bodys integumentary system. Structure and function of the skin mcgrath major reference.
It has many functions including protecting us from weather and infections and shaping the body. The skin is made up of three distinct layers, all with their own distinct functions. Beneath the epidermis and dermis is a layer of fat. It is the largest organ of the body and is waterresistant.
Sebum, secretion controlled by androgen activity located in the dermis, drain into hair follicle most prominent on scalp, face and trunk. See how the skin is involved in the regulation of body temperature. The thickness, pigmentation, and distribution of the appendages of the skin vary in different parts of the body, depending upon the function and needs of the area. It is the outer layer of a persons body and performs a lot of very important functions for the body. The skin consists of three main layers epidermis, dermis and subcutaneous tissue. In mammals, the skin is an organ of the integumentary system made up of multiple layers of ectodermal tissue, and guards the underlying muscles, bones, ligaments and internal organs. In direct contact with the outside environment, the skin helps to maintain four.
The total skin surface of an adult ranges from 1220 square feet. Structure and function of the skin skin disorders msd. This document will teach all the essentials your students need to know about skin, including the structure of the skin layers, the function of skin, and common diseases and conditions that affect the skin. Structure and function of skin, hair and nails sciencedirect. The structure and function of skin 3rd edition by william montagna author visit amazons william montagna page. Full text full text is available as a scanned copy of the original print version.
Accessory structures of the skin include hair, nails, sweat glands, and sebaceous glands. Facts skin is composed of two layers, the epidermis and the dermis. Pdf the structure of skin and transdermal drug delivery. Describe the structure and function of sweat glands and sebaceous glands. Recent advances in molecular science have provided fascinating new insights into stem cell biology and skin homeostasis as well as disease. The dermis is the middle layer of the skin, and the subcutis is the innermost layer of the skin. The skin interfaces with the environment and is the first line of defense from external factors.
Authoritative facts about the skin from dermnet new zealand. The top layer is the epidermis, a waterproof cover that keeps germs out. Structure of the skin what is the function of the skin. The skin absorbs essential nutrients and oils through the pores and this provides moisture to the skin. Structure and function responses are normally accompanied by in. Which of the following is a sign that a mole might have become melanoma a skin cancer.
Find all the books, read about the author, and more. It protects us from microbes, helps in controlling body temperature, and aids the body in sensing heat, cold, and touch. Lss the skin alexandra burkesmith 1 introduction to the skin the skin 1 prof tony chu t. It is a complex epithelial and mesenchymal tissue comprising a multilayered stratified epidermis, adnexal structures such as hair follicles, sweat glands and sebaceous glands, a dermis containing collagen and elastic fibres, and underlying subcutaneous fat.
It is a waterproof, airtight and flexible barrier between the environment and internal organs. A soft and smooth b dry in spots, but fine everywhere else c tight and dry all over d a little oily 2. Understanding your skins structure is the first step to maintaining the health of your armor against the outside world. Mar 06, 2014 a video of a presentation about the skin and its function that i use for revision of anatomy and physiology in my nursing degree. They originate from cells in the deepest layer of the epidermis called the basal layer. Structure and function of the skin skin disorders merck. Nurses need to understand the skin and its functions to identify and manage skin problems. This article, the first in a twopart series, looks at the skin s structure and key functions. The skin is the bodys largest organ and weighs between 3 and 10 kg 820 pounds. Plus, get practice tests, quizzes, and personalized coaching to help you succeed. More than disease entities involving the skin have been described and up to 20% of. Describe the structure and function of hair and nails.
In terms of chemical composition the skin is about 70% water, 25% protein and 2% lipids. It explains the different functions of the skin and outlines its. The skin is the largest organ in the body and is wide spread throughout the whole body. The skin is an outer protective layer of the body, also known as an integument. Jan 22, 2010 skin is the largest organ of the body, covering an area of 1. Despite being just a few millimeters thick, skin makes up. Beneath the dermis lies the hypodermis or subcutaneous fatty tissue. As a member, youll also get unlimited access to over 79,000 lessons in math, english, science, history, and more. Drawing upon the accumulated data derived from embryology, histology, anatomy, physiology, biochemistry, and pharmacology, this book presents an overview of skin, with emphasis on human skin. Epidermis outermost layer of skin derived from basal membrane stratum basale presents the openings of hair follicles epidermis consists of 4 sublayers 1. Structure and function of the skin msd manual consumer version. Descriptions of skin marks, growths, and color changes. Most regions of the body have four layers but skin exposed to friction, such.
The skin surface is not smooth, but is laced with multiple net works of fine grooves called sulci cutis. It keeps the internal environment of our body stable. The structure and function of skin, third edition is devoted to all matters pertaining to the structure and function of the skin. If that seems like a lot, remember that skin is your largest organ. Structure and functions of the skin clinical dermatology.
The skin is the largest organ in the body, comprising about 15% of body weight. Oct 28, 2014 the most important lesson from 83,000 brain scans daniel amen tedxorangecoast duration. Terms in this set 12 skin definition a waterproof, flexible, but tough protective covering for your body. Download and label the components shown on the diagram. In addition, there is a full medical terminology included tables for all the essential skin terms. Other animal coverings, such as the arthropod exoskeleton, have different developmental origin, structure and chemical composition.656 1389 167 322 75 1049 595 646 1205 1395 323 1298 892 1350 152 1170 871 798 1384 1393 336 801 799 633 1341 704 1518 515 345 1226 835 1319 1437 1380 364 1028 801 1478 284 1086 1318 978 116 1433