1. 3.05 Remember the structures of the Integumentary System

2. Essential Questions
What are the structures of the integumentary system?
3.05 Remember the structures of the integumentary system

3. Structures of the integumentary system
Layers of the integumentary system
Our LARGEST organ!
Epidermis
Dermis
Subcutaneous
About the size of a shower curtain in an adult.
3.05 Remember the structures of the integumentary system

4. Structures of the integumentary system
Epidermis
Outermost covering
Made of epithelial cells
Avascular
3.05 Remember the structures of the integumentary system

5. Structures of the integumentary system
Epidermis
Stratum corneum-the outermost layer of the epidermis;
the 1st line of defense against invading bacteria; flakes
off due to constant friction of clothing, rubbing.
Thickest on the palms and soles of the feet due to
constant friction.
Stratum germinativum-the deepest layer of the epidermis;
constantly reproducing itself in case it is injured; contains
melanocytes-melanin gives skin its color. The lower edge of
The stratum germinativum is thrown into ridges called
papillae-these ridges make the fingerprints.
3.05 Remember the structures of the integumentary system 5

6. Structures of the integumentary system
Dermis
Second layer of skin
True skin
Made of connective tissue
Vascular
3.05 Remember the structures of the integumentary system

7. Structures of the integumentary system
*Dermis contains many structures (organs)
Connective tissue
Collagen tissue bands
Elastic fibers
*Numerous blood vessels
*Nerve endings
Muscles
*Hair follicles
*Oil glands (sebaceous glands)
*Sweat glands (sudoriferous glands
Fat cells
subcutaneous

8. Structures of the integumentary system
*Subcutaneous layer
*Innermost layer of the skin
Hypodermal-lies under the dermis
Sometimes called superficial fascia
Consists of loose connective tissue
Contains one-half of the body’s stored adipose tissue
epidermis,
dermis
subcutaneous

9. Structures of the integumentary system
With age, the subcutaneous layer begins to disappear; this causes the skin to sag and wrinkle.
epidermis,
dermis
subcutaneous
3.05 Remember the structures of the integumentary system

10. Structures of the integumentary system
*Appendages
Hair (no hair on palms of hands, soles of feet, glans penis, inner vagina labia)
Nails
Glands
Sweat glands
Sebaceous glands
epidermis,
dermis
subcutaneous
3.05 Remember the structures of the integumentary system

11. Structures of the integumentary system
Hair
Cortex and medulla
Root and shaft
Hair follicle
Papilla
Arrector pili muscle
Beards are the fastest growing hairs.
Nearly 30 feet in a lifetime!
3.05 Remember the structures of the integumentary system

12. Structures of the integumentary system
Hair
*Cortex-outer part of the hair
Medulla-inner part of the hair
Root-the part of the hair implanted in the skin
Shaft-projects from the skin; what we see
Hair follicle-hold the root in the epidermis
Papilla-contains capillaries that nourish the follicle
Arrector pili muscle-smooth muscle attached to the hair follicle; contracts and the skin puckers around the hair causing “goosebumps” 12

13. Structures of the integumentary system
*Nails
Made of *keratin-makes the nail hard; provides a waterproof covering.
Originate from the nail root
*Matrix is the nail bed
Did you know????
In Egypt, the status of women were established by the color of their nail… red being the highest.

14. Structures of the integumentary system
Sudoriferous glands
Sweat glands
Present in large numbers under arms, palms of hands, and soles of feet
3.05 Remember the structures of the integumentary system

15. Structures of the integumentary system
Sebaceous glands
Oil glands
microscopic glands
located adjacent to a hair follicle
3.05 Remember the structures of the integumentary system

16. Structures of the integumentary system
Microscopic view
of the skin
3.05 Remember the structures of the integumentary system

17. Essential Questions
What are the structures of the integumentary system?
3.05 Remember the structures of the integumentary system