The integumentary system has three main components: the skin, hair, and nails. The skin is the major organ and acts as a barrier between the internal and external environments. It has three layers - the epidermis, dermis, and subcutaneous layer. Hair is found in the dermis layer and is composed of the protein keratin. Nails cover and protect the ends of fingers and toes. The document also defines several integumentary system-related medical terms such as dermatitis, melanocyte, onychophagia, and xeroderma.

1. Integumentary System
Chapter 3
End of Chapter Review Section B

2. What Makes This System Whole?
 The Integumentary System has three components.
- Skin is the major organ in the system and acts
as a barrier between the internal and external
environments.
 The skin has three parts: the epidermis, dermis and the
subcutaneous layer. (Illustration below)

3. What Makes This System Whole?
(CONTINUED)
 Hair is the one of the two accessory organs in the
system that can be found in the dermis layer of
the skin. They are composed of the protein
keratin.

4. What Makes This System Whole?
(CONTINUED)
 Nails are the final accessory organs in the
integumentary system. They cover and protect
the ends of the fingers and toes.

5. Dermatitis
 Dermat - Skin
From the combining from dermat/o
 -Itis – Inflammation
Inflammation of the skin = Dermatitis

6. MELANOCYTE
 Melano – Black
 -Cyte – Cell
A black cell - Melanocyte

7. ONYCHOPHAGIA
 Onych/o – Nail
 -Phagia – Eating
Nail biting or eating = Onychophagia

8. XERODERMA
 XER/O – DRY
 DERMA - SKIN
DRY SKIN = Xeroderma

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