The Infamous Integumentary System

An insight to your skin, hair, nail, and glands.

Fast Facts & Functions

Largest organ in body

Most visible organ of the body

SkinHairNailsGlands

Protection Maintain body

temperature Stores nutrients (fat) Senses (touch, pain…)

Excretion (of salts and water)

Secretion (oil, waste, milk)

The layers and parts

Epidermis

Dermis

Subcutaneous layers

Accessory structures

The outer, epidermis, layer

Stratified squamous epithelia This epithelia is divided into 5 layers:

1. Stratum germinativum

2. Stratum spinosum

3. Stratum granulosum

4. Stratum lucidum

5. Stratum corneum

– Normally takes 2-4 weeks for cells to move from the bottom to the top

The middle and inner

The middle: Dermis

Papillary layer

Reticular layer

The inner: Subcutaneous Layer

Connective tissue fibers

Loose connective tissues and fat cells

The Accessory Organs

Hair– Originate in dermis

and subcutaneous layer

– Keratinization occurs– Arrector pili: goose

bumpsSebaceous glands

– Oil, waxy substance, fats = sebum

Sweat glands– Discharge sticky

substance; it smells when bacteria breaks it down

– Release sweat to cool body

Nails– Made of many dead

keratin cells

The Epidermis

http://www.udel.edu/biology/Wags/histopage/colorpage/cin/cintsm.GIF

The sebaceous gland

http://www.udel.edu/biology/Wags/histopage/colorpage/cin/cintsm.GIF

Thick skin melanin

http://www.udel.edu/biology/Wags/histopage/colorpage/cin/cintsm.GIF