the integumentary system n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
The Integumentary System PowerPoint Presentation
Download Presentation
The Integumentary System

Loading in 2 Seconds...

play fullscreen
1 / 29

The Integumentary System - PowerPoint PPT Presentation


  • 78 Views
  • Uploaded on

The Integumentary System. The Skin and its Appendages. The Skin. Two main components Epidermis Dermis (Hypodermis). Epidermis. Cells of the Epidermis Keratinocytes Melanocytes Dendritic Cells (Langerhans cells). Epidermis. Layers of the Epidermis Thick Skin Stratum Basale

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'The Integumentary System' - ajay


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
the integumentary system

The Integumentary System

The Skin and its Appendages

the skin
The Skin

Two main components

  • Epidermis
  • Dermis
  • (Hypodermis)
epidermis
Epidermis

Cells of the Epidermis

  • Keratinocytes
  • Melanocytes
  • Dendritic Cells (Langerhans cells)
epidermis1
Epidermis

Layers of the Epidermis

  • Thick Skin
    • Stratum Basale
    • Stratum Spinosum
    • Stratum Granulosum
    • Stratum Lucidum
    • Stratum Corneum
  • Thin Skin
    • Absence of Stratum Lucidum
epidermis2
Epidermis

Layers of Epidermis

  • Stratum Basale (germinatum)
  • Single row of stem cells
  • 10-25% melanocytes
  • very small amount of tactile cells
epidermis3
Epidermis

Layers of the Epidermis

  • Stratum Spinosum
    • several cells thick
    • weblike intermediate filament network
    • melanin granules and dendritic cells present
epidermis4
Epidermis

Layers of the Epidermis

  • Stratum Granulosum
    • Keratinization Begins
    • Keratohyaline granules
    • Lamellar granules
epidermis5
Epidermis

Layers of the Epidermis

  • Stratum Lucidum
    • Only present in thick skin
    • 2-3 rows of clear, flat, dead keratinocytes
epidermis6
Epidermis

Layers of the Epidermis

  • Stratum Corneum
    • anucleate
    • 20-30 cells thick
    • ¾ of epidermis
    • high keratin content
    • thickened, glycoprotein covered plasma membranes
    • loses 50k cells/min
dermis
Dermis

Composition

  • Connective Tissue proper
  • Rich nerve and vascular supply
  • contains hair follicles, glands, and sensory receptors

Layers

  • Papillary Layer
  • Reticular Layer
dermis1
Dermis

Papillary Layer

  • Thin
  • areolar
  • highly vascularized
  • low density (great for phagocytes)
  • Dermal papillae (form friction ridges in thin skin)
dermis2
Dermis

Reticular layer

  • 80% of Dermis
  • dense irregular connective tissue
  • blood vessel network (cutaneous plexus)
  • cleaveage and flexure lines
appendages of the skin
Appendages of the Skin
  • Hair and Hair Follicles
  • Nails
  • Sweat Glands
    • Eccrine Glands
    • Apocrine Glands
  • Sebaceous (oil) Glands
appendages of the skin1
Appendages of the Skin

Hair and Hair Follicles

  • Structure of hair
  • Structure of a hair follicle
  • Types and growth of hair
  • Hair thinning and baldness
appendages of the skin2
Appendages of the skin

Structure of a hair (fig 5.5)

  • Produced by hair follicles
  • Conists primarily of dead keratinized cells
  • cells contain hard keratin

Regions

  • Shaft
  • Root

Concentric Layers

  • Medulla
  • Cortex
  • Cuticle
appendages of the skin3
Appendages of the skin

Structure of a Hair Follicle (fig 5.5)

  • Epithelium based
  • Hair bulb
  • Hair follicle receptor
  • Hair papillae
  • Peripheral connective tissue sheath
  • Epithelial root sheath
appendages of the skin4
Appendages of the Skin

Types and Growth of Hair

  • Vellus Hair
  • Terminal Hair
appendages of the skin5
Appendages of the Skin

Hair Thinning and Baldness

  • Alopecia
  • True Baldness (Male Pattern)
appendages of the skin6
Appendages of the Skin

Nails (fig 5.6)

  • Scale-like modification of epidermis
  • hard keratin
  • free edge, nail plate, root
  • nail bed
  • nail matrix
  • nail folds and cuticle
appendages of the skin7
Appendages of the Skin

Sweat (Sudoriferous) Glands

  • Eccrine (Merocrine) Sweat Glands
  • Apocrine Sweat Glands
appendages of the skin8
Appendages of the Skin

Sebaceous (Oil) Glands

  • Simple branched alvolar glands
  • secrete sebum
  • holocrine type glands
  • secrete into hair follicles and occasionally pores
skin functions
Skin Functions

Protection

  • Chemical Barriers
    • acid mantle
  • Physical Barriers
  • Biological Barriers
    • dendritic cells, macrophages, DNA
skin functions1
Skin Functions

Body Temperature Regulation

Heat Loss

  • Vaodilation
  • heat loss through sweat evaporation

Heat conservation

  • Vasoconstriction
skin functions2
Skin Functions

Cutaneous Sensation

skin functions3
Skin Functions

Metabolic Functions

  • Produces vitamin D precursor
  • disarm cancer causing chemicals
  • activate some steroid hormones
skin functions4
Skin Functions

Blood Resevoir

  • 5% of total blood volume
skin functions5
Skin Functions

Excretion

  • ammonia, uric acid, urea, salt, water.
homeostatic imbalances of skin
Homeostatic Imbalances of Skin

Skin Cancer

  • Basal Cell Carcinoma
  • Squamous Cell Carcinoma
  • Melanoma
    • Asymmetry
    • Border Irregularity
    • Color
    • Diameter
    • Elevation
study guide
Study Guide

Will Post Wednesday