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Transcript 
INTEGUMENTARY SYSTEM
SKIN
Health Science Technology I
Dr. Halbert
Three main layers of skin
Epidermis
Dermis
Subcutaneous
Fatty Tissue
Epidermis
• Outermost layer
• Cells constantly being
shed
• Contains no blood
vessels or nerves
• 5 layers
– Stratum corneum:
outer part
– Stratum germinativum:
inner layer
Dermis
• “true skin”
• Made up of elastic
connective tissue and
contains vessels,
nerves, glands, hair
follicles
• Top layer covered
with papillae which
form ridges which
make up our
fingerprints
Subcutaneous fascia or
hypodermis
• Innermost layer
• Connects skin to the muscle underneath
Sudoriferous glands
• Sweat glands
• Eliminate water, salts
and some body
wastes
• Coiled tubes
Sebaceous
glands
• Oil glands
• Produce sebum
• Open in to hair
follicles
• When plugged results
in pimple or
blackhead
Alopecia
• Lack of hair
Functions of the skin
•
•
•
•
•
•
•
Protection
Perception
Regulation of temperature
Storage of fat, water, vitamins
Absorption
Excretion
Production of Vitamin D
Skin pigment
• Melanin: brown-black pigment, does
absorb UV light resulting in a tan
• Carotene: yellowish-red pigment
Albino
• Absence of color pigment
Erythema
• Reddish color of the skin
• Burns or congestion of blood in vessels
Jaundice
• Yellow discoloration
• Liver or gallbladder disease or destruction
of red blood cells
Cyanosis
• Bluish discoloration
• Insufficient oxygen
Macules
• Flat spots on the skin
• Ex: freckles
Papules
• Firm raised areas
• Pimples
• Some stages of chicken pox
Vesicles
• Blisters
• Fluid filled sacs
• Chicken pox
Pustules
• Pus filled sacs
• Ex: acne
Crusts
• Dried pus and blood
• scabs
Wheals
• Itchy elevated areas with irregular shape
• Hives
Ulcer
• Deep loss of skin surface
Acne Vulgaris
• Inflammation of the sebaceous glands
• Usually in adolescence
• Hormonal changes, increased secretion of
sebum are underlying causes
Athlete’s foot
• Contagious, fungal infection usually of feet
• Blisters, cracks, itching
Skin cancer
• Melanoma, squamous cell carcinoma,
basal cell carcinoma
• May develop from moles
Dermatitis
• Inflammation of the skin
• Caused by any substance that irritates
skin, often allergic
• Example: poison ivy
Eczema
• Non contagious, inflammatory disorder
• Caused by allergy or irritant
• Dryness, edema, erythema, itching,
vesicles, crusts
Impetigo
• Highly contagious
• Bacterial infection- Staph or Strep
• Pustules and yellow crusts
Psoriasis
• Chronic, non contagious, inherited
• Thick red area with white scales
Ringworm
• Contagious, fungal infection
• Usually circular with a clear central area
Verrucae
• Warts
• Viral
• Rough, hard, elevated
Image Citations
• Slide 4: Delmar Learning’s Medical Terminology Image Library,
Second Edition. Version 1.0. ISBN: 1-4018-1009-8.
• Slide 10: 1/3/06 Erythema Nodosum,
http://medimages.healthopedia.com/large/erythema-nodosum.jpg
• Slide 11: 1/3/06 http://medicine.ucsd.edu/clinicalmed/jaundice.JPG
• Slide 12: 1/3/06 Central Cyanosis,
http://www.lf2.cuni.cz/Projekty/interna/foto/014/pic00011.jpg
• Slide 16: 1/3/06 Papules,
http://www.acnesource.org/images/pic_papules.jpg
• Slide 17: 1/3/06 Vesicles,
http://www.acponline.org/graphics/bioterro/vesicles.jpg
• Slide 18: 1/3/06 Staphlococcal pustules,
http://www.adhb.govt.nz/newborn/TeachingResources/Dermatology/
StaphPustule/StaphPustule.jpg
• Slide 20: 1/3/06
http://sprojects.mmi.mcgill.ca/dermatology/wheal3.jpg
• Slide 21: 1/3/06 Skin Ulcer,
http://www.liv.ac.uk/researchintelligence/issue18/images/W041128R
.jpg
Image Citations
•
•
•
•
•
•
•
•
•
Slide 23: 1/3/06 Acne Vulgaris,
http://medimages.healthopedia.com/large/acne-vulgaris.jpg
Slide 24: 1/3/06 Athlete’s foot, tinea pedis, www.nlm.nih.gov
Slide 25: 1/3/06 Skin Cancer, www.healingdaily.com
Slide 26: 1/3/06 Allergic Contact Dermatitis, www.immunologyclinic.com
Slide 27: 1/3/06 Eczema,
http://www.pg.com/science/skincare/Skin_tws_55/Skin_tws_55_03.jpg
Slide 28: 1/3/06, Impetigo, http://www.manbironline.com/grafics/impetigo.jpg
Slide 29: 1/3/06, Psoriasis, www.monpso.net
Slide 30: 1/3/06, Ringworm,
http://www.avte.net/AVTE2003/contents/hazards/zoonotic%20hazards/ha_ri
ngworm.jpg
Slide 31: 1/3/06, http://vasculitis.med.jhu.edu/treatments/images/warts.jpg
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