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In zootomy, the integumentary system is the external covering of the body, comprising the skin, hair, scales, nails, sweat glands and their products (sweat and mucus). The integumentary system has a variety of functions; in animals, it may serve to waterproof, cushion and protect the deeper tissues, excrete wastes, regulate temperature and are the location of sensory receptors for pain, pressure and temperature. The name derives from the Latin integumentum, which means 'a covering'.
Additional recommended knowledge
As an organ system
The integumentary system is often the largest organ system of an animal by surface area. It distinguishes, separates, protects and informs the animal with regard to its surroundings. Small-bodied invertebrates of aquatic or continually moist habitats respire using the outer layer (integument). This gas exchange system, where gases simply diffuse into and out of the interstitial fluid, is called integumentary exchange. if we didnt have it we would bleed to death, and get infections.
The cutaneous membrane (skin) and its accessory structures (hair, scales, feathers, nails, exocrine glands) make up the integumentary system.
There are three layers of skin:
Below the dermis, the subcutis acts to protect underlying muscles, tissues, and other organs. Hair on the surface of the skin helps maintain body temperature and filter out harmful particles.
Cutaneous glands include:
The epidermis is the thin outer layer of skin that contains melanin which gives skin its color and allows for the skin to tan. Carotene, and oxygen-rich hemoglobin also contributes to the color of skin. The epidermis also encompasses the protein keratin which stiffens epidermal tissue to form finger nails. The outermost layer consists of 25-30 layers of dead cells. Further levels include:
It is divided into the following sub-layers:
Epidermis is divided into the following 5 sublayers or strata:
The dermis is the bottom-most, thick inner layer of skin, which comprises blood vessels, connective tissue, nerves, lymph vessels, sweat glands and hair shafts. It has two main layers:
The subcutaneous tissue or subcutis is the layer of tissue directly underlying the cutis. It is mainly composed of adipose tissue. Its physiological function includes insulation and storage of nutrients.
The integumentary system has multiple roles in homeostasis. All body systems work in an interconnected manner to maintain the internal conditions essential to the function of the body. The skin has an important job of protecting the body and acts somewhat as the body’s first line of defense against infection, temperature change or other challenges to homeostasis. Functions include:
Diseases and injuries
The specialized treatment of the integumentary system is performed by dermatologists. Possible diseases and injuries to the human integumentary system include:
In botany, the integument refers to the envelope of an ovule.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Integumentary_system". A list of authors is available in Wikipedia.|