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Chapter 5: The Integumentary System
STUDY!
12
Anatomy
Undergraduate 2
10/18/2009

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Term
Integumentary System
Definition

- regulates homeostasis(Protects/Regulates Temp/Sensory info.)

- Consists of: Skin, hair, oil/sweat glands, nails, sensory receptors

- Skin #1 esposed: disease, infection, injury

-Skin color change- reflects homeostasis inbalances

 

Term
Dermatology
Definition
Medical speciality: Diagnosis/Treatment of Integumentary system disorders
Term
Skin (Cutaneous membrane/Integument)
Definition

-External surface

-Largest Organ

-about 16% of body weight, 2 square meters

-Consists of 2 main parts (Epidermis and Dermis)

Term
Epidermis
Definition

-Superficial/Thinner portion

- Epithelial tissue

Term
Dermis
Definition

-Deeper/thicker

-Connective Tissue

Term

Subcutaneous Layer (sub Q) =

Hypodermis

Definition

- Areolar/Adipose Tissues

- Contains: Fat/large blood vessels

- Contains nerve endings - Pacinian (lamellated) corpuscles (sensitive to pressure)

Term
Epidermis
Definition

-Contains: Keratinized stratified squamous epithelium

- 4 Major Types of Cells

(keratinocytes, melanocytes, Langerhans Cells, Merkel Cells)

Term
Keratinocytes
Definition

-90% of Epidermal Cells

- Arranged in 4/5 layers

- Produce Keratin protein

Term
Keratin
Definition

-A protein

-Tough/Fibrous Tissue

-Protects Skin: heat, microbes, chemicals

-Produce Lamellar granules (inhibits the entry of foreign materials)

Term
Melanocytes
Definition

-8%

-Produce pigment melanin

-Between Keratinocytes, transfer melanin to them

Term
Melanin
Definition

-yellow-red/brown-black pigment

-skin color, absorbs UV light

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