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The Integumentary System

3 THE INTEGUMENTARY SYSTEM

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Introduction

T he integumentary system consists of the skin, the subcutaneous tissue below the skin, hair, nails,

and assorted glands. The most obvious function of the integumentary system is the protection that
the skin gives to underlying tissues. The skin not only keeps most harmful substances out, but also
prevents the loss of fluids.

A major function of the subcutaneous tissue is to connect the skin to underlying tissues such as
muscles. Hair on the scalp provides insulation from cold for the head. The hair of eyelashes and
eyebrows helps keep dust and perspiration out of the eyes, and the hair in our nostrils helps keep dust
out of the nasal cavities. Any other hair on our bodies no longer serves a function, but is an
evolutionary remnant. Nails protect the tips of fingers and toes from mechanical injury. Fingernails
give the fingers greater ability to pick up small objects.

There are four types of glands in the integumentary system: Sudoriferous glands, Sebaceous
glands, Ceruminous glands, and Mammary glands. Sudoriferous glands are sweat producing glands.
These are important to help maintain body temperature. Sebaceous glands are oil producing glands
which help inhibit bacteria, keep us waterproof and prevent our hair and skin from drying out.
Ceruminous glands produce earwax which keeps the outer surface of the eardrum pliable and prevents
drying. Mammary glands produce milk.

Skin

In zoologyy and dermatology, skin is an organ of the integumentary system made up of a layer of
tissues that guard underlying muscles and organs. As the interface with the surroundings, it plays the
most important role in protecting against pathogens. Its other main functions are insulation and
temperature regulation, sensation and vitamin D and B synthesis. Skin is considered one of the most
important parts of the body.

Skin has pigmentation, melanin, provided by melanocytes, which absorbs some of the potentially
dangerous radiation in sunlight. It also contains DNA repair enzymes which reverse UV damage, and
people who lack the genes for these enzymes suffer high rates of skin cancer. One form predominantly
produced by UV light, malignant melanoma, is particularly invasive, causing it to spread quickly, and
can often be deadly. Human skin pigmentation varies among populations in a striking manner. This has
sometimes led to the classification of people(s) on the basis of skin color.

Damaged skin will try to heal by forming scar tissue, often giving rise to discoloration and
depigmentation of the skin.

The skin is often known as "the largest organ in the human body". This applies to exterior surface,
as it covers the body, appearing to have the largest surface area of all the organs. Moreover, it applies
to weight, as it weighs more than any single internal organ, accounting for about 15 percent of body

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