THE INTEGUMENTARY SYSTEM

Introduction to our skin, hair, nails, and exocrine glands.

Structure and Function of the Integumentary System

This organ system gives us shape. Although it may seem unessential, the integumentary system prevents us from being a puddle of muscles and bodily fluids. It is compromised of our skin, hair, nails, and exocrine glands. According to Tim Taylor (InnerBody, n.d.) "the average person’s skin weighs 10 pounds and has a surface area of almost 20 square feet."

THE EPIDERMIS

Structure and Function

The epidermis is the outmost layer of the skin, it is mostly composed of keratinocytes. The epidermis has 5 layers, stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum. The cells of each layer, named from inner most to outermost layer, move outwards and are replaced by new cells. The epidermis also has melanocytes, which contain the melanin pigment, a chemical which gives colour to your skin.

Big image

THE DERMIS

Structure and Function

The dermis is an interesting layer of the skin, it contains nerve endings, sweat glands, sebaceous glands, hair follicles, and some blood vessels. A very important job that the dermis does is temperature regulation, also referred to as homeostasis. It also serves as a filter, the sebaceous glands near the hair follicles prevent foreign substances from entering your body.

Big image

The Hypodermis

Structure and Function

Below the dermis is a layer of fat that helps insulate the body from extreme temperatures, it provides protective padding, and serves as an energy storage area, it is also the thickest layer of the skin. The fat is contained in living cells that are held together by fibrous tissue. The hypodermis is also called the subcutaneous tissue, this name is merited by the composition of the layer. Another function of the hypodermis is to provide a pathway for waste and nutrients to travel from the epidermis and dermis and to the higher levels.

Big image

SOURCES

A Bit of Reinforcement:

The Integumentary System, Part 1 - Skin Deep: Crash Course A&P #6