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Title:

Integumentary System

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Title: Integumentary System Author: warren Last modified by: warren Created Date: 11/4/2011 5:37:24 PM Document presentation format: On-screen Show – PowerPoint PPT presentation

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Title: Integumentary System


1
Integumentary System
2
Epidermis
  • Outer layer of skin
  • Stratified squamous
  • Has no blood supply
  • Cells go through process of keratinization
  • Regular skin has four strata
  • Thick skin has five strata

3
Stratum basale
  • Next to basement membrane and blood supply
  • Active mitosis
  • Contain melanocytes

4
Stratum spinosum
  • Consists of several layers
  • Spiny projections extend down to connect layers
    together

5
Stratum germinativum
  • Composed of two layers
  • Stratum basale
  • Stratum spinosum

6
Stratum granulosum
  • 2-3 layers of flattened cells
  • Keratinization begins here

7
Stratum Lucidum
  • Translucent 2-3 layers
  • Only found in thick skin

8
Stratum corneum
  • Outermost layer
  • ¾ of thickness
  • 20-30 layers
  • Cells are completely keratinized
  • 5 week life cycle

9
Dermis
10
Dermis
  • Stratum corium
  • Made of dense connective tissue
  • Papillary layer
  • Reticular layer

11
Subcutaneous layer
  • Anchors skin
  • Loose connective and adipose tissues
  • Also called hypodermis or superficial fascia

12
Skin Color
13
Functions
  • Protection
  • Sensory reception
  • Regulation of body temperature
  • Synthesis of vitamin D

14
Epidermal Derivatives
  • Hair and hair follicles
  • Nails
  • Glands

15
Hair and hair follicles
  • Composed of dead, keratinized cells
  • Produced from stratum basale
  • Color determined by melanin production
  • Texture determined by shape of hair shaft

16
Nails
  • Layers of dead stratum corneum
  • Stratum basale forms nail bed

17
Glands
  • Three types
  • Sebaceous
  • Sudoriferous
  • Ceruminous

18
Sebaceous glands
  • Found everywhere there is hair
  • Holocrine glands
  • Secrete sebum
  • Keeps skin and hair pliable
  • Inhibits bacterial growth and helps prevent water
    loss
  • Activated by increased sex hormones

19
Sudoriferous glands
  • Sweat glands
  • Located everywhere except the lips, nipples, and
    parts of the external genitalia
  • Merocrine and apocrine glands

20
Ceruminous glands
  • Modified sweat glands in the ear canal
  • Secrete cerumen

21
ABCD Rule for Moles
22
Burns
  • First degree
  • Second degree
  • Third degree
  • Rule of nines

23
First degree burn
24
Second degree burn
25
Third degree burn
26
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