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The Integumentary System

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Ch. 5 The Integumentary System Objectives Identify various parts of the integument Know the functions of the integumentary system Know the structural composition of ... – PowerPoint PPT presentation

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Title: The Integumentary System


1
The Integumentary System
  • Ch. 5

2
Objectives
  • Identify various parts of the integument
  • Know the functions of the integumentary system
  • Know the structural composition of hair and nails
  • Understand how skin disorders like cancer and
    burns are classified and what occurs during these
    disorders

3
The Integumentary System
  • Includes the skin (integument) and the accessory
    organs found within the skin

4
Skin Integumentary System
  • Functions prevent dehydration, protect from
    injury, serve as defense against microorganisms,
    regulate body temperature, make vitamin D,
    provide sensation, nonverbal communication
  • Structure
  • Epidermis outer layer, stratified squamous
    epithelial cells, no blood vessels, specialized
    keratinocytes and melanocytes
  • Dermis deeper layer, support tissues, fibers

5
Skin Integumentary System
6
Epidermis
  • Keratinized stratified squamous epithelium
  • Cell types
  • Regenerative stem cells
  • Keratinocytes
  • Melanocytes
  • Tactile cells
  • Dendritic cells

7
Layers of the Epidermis
  • From deep out
  • Stratum basale
  • Stratum spinosum
  • Stratum granulosum
  • Keratohyaline granules
  • filaggrin
  • Lamellated granules
  • Stratum lucidum
  • Thick skin only
  • Stratum corneum

pgbeautygroomingscience.com
8
Skin Histology
nku.edu
9
Skin Color
  • Melanin
  • The more produced, the darker the color
  • Hemoglobin
  • Reddish pink skin tones
  • Carotene
  • Yellow hue to skin
  • Concentrates in stratum corneum

10
Dermis
  • Connective tissue layer deep to the epidermis
  • Attached to the epidermis via dermal papillae
  • Interlocking arrangement with epidermal ridges
  • Two layers
  • Papillary
  • Areolar
  • Reticular
  • Dense irregular

11
Accessory Structures of Dermis
  • Hair shaft, follicle
  • Smooth muscle attached to hair follicle, raises
    hair to upright position
  • Oil glands/sebaceous glands secretion moistens
    and softens skin

12
Accessory Structures of Dermis (cont.)
  • Sweat glands secrete sweat, help in temperature
    regulation
  • Apocrine and merocrine
  • Blood vessels supply nutrients, remove waste,
    assist in temperature regulation
  • Sensory nerve endings for heat, cold, touch,
    deep pressure, vibration

13
Dermis
healthguide.howstuffworks.com
14
Hypodermis
  • Binds skin to underlying tissue
  • Functions as padding and insulation
  • Subcutaneous fat
  • Readily absorbs drugs given by hypodermic
    injection
  • Highly vascular

15
Hair
  • Pili (sing. Pilus) are composed of hard, dead
    keratinized cells
  • Grow from a follicle that is typically found in
    the dermis
  • Hair divided into three zones
  • Bulb which lies in the follicle
  • Root
  • Shaft

keratin.com
16
Nails
  • Scale-like modifications of the epidermis
    (startum corneum)
  • Dead cells full of parallel hard keratin

emedicinehealth.com
17
Skin Disorders
  • Skin Cancer
  • One of the most prevalent cancers
  • UV radiation damages cells
  • Three types
  • Basal cell carcinoma
  • Most common, stratum basale
  • Squamous cell carcinoma
  • Stratum spinosum
  • Malignant melanoma
  • Most deadly, melanocytes

metrohealth.org
18
Burns
  • Classified based on depth of tissue involvement
  • First degree
  • Epidermis
  • Red, slight swelling
  • Second degree
  • Epidermis and into part of the dermis
  • Red to white, more painful
  • Regeneration of epidermis possible
  • Third degree
  • Full-thickness, completely through dermis and
    beyond
  • Tan to brown, danger of fluid loss and infection
  • Generally require skin grafts to replace dermis
    and epidermis

burn-recovery.org
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