Title: The Integumentary System
1The Integumentary System
2What is it?
- It is the system composed of hair, skin and
nails. - A system is an association of two or more organs
that work together to do something
Nail
Skin
Hair
3Skin
- Largest organ of the body
- 2 layers dermis (lower) and epidermis (upper)
- SA of 1 to 2 meters
- 16 of body weight
A common sweat gland B hair follicle C
arrector pili D sebaceous gland E hair shaft F
epidermis G dermis pars papillaris H dermis
pars reticularis I hypodermis
4Skin Parts
- Arrector Pili Erects hair during cold or
emotional stress - Sebaceous Gland Oil gland Keeps skin from
drying out - Epidermis Upper layer of skin Protects dermis
and rest of body - Dermis Below epidermis Contains nerve-endings,
sweat and subaceous glands, and blood and lymph
vessels - Hypodermis Independent fat cells below dermis
F epidermis G dermis pars papillaris H
dermis pars reticularis I hypodermis
A common sweat gland B hair follicle C
arrector pili D sebaceous gland E hair shaft
5Skin Functions in Homeostasis
- Protection
- Body temperature regulation
- Sensory reception
- Water balance
- Syntheses of vitamins and hormones
- Absorption of materials
6Common Skin Pathology
- Apocrine glands produce a solution that bacteria
act upon to produce body odor - If the sebaceous glands become plugged and
infected, it becomes a blemish or pimple - Cancer carcinoma and melanoma
- Contact dermatitis (e.g. poison ivy)
- Burns First, second and third degree
- Wrinkles
- Calluses
- Moles
- Psoriasis
- Hair loss
- Frostbite
7Common Pathology PicturesPart 2
Melanoma
Dermatitis
Nickel Allergy
Warts
Kaposis Saracoma
8Wrinkles
- Major difference between young and old
- Loss of elasticity
- More common in light-skinned people
- Cross-linking collagen fibers
9Thick vs. Thin
10Thin Skin Thin EpidermisThick vs. Thin Part
II
- Epidermis of thick skin is 10x epidermis of thin.
- The different is in the thickness of the st.
corneum - Thickest skin on body is the thin skin on the back
11Miscellaneous Skin Info
- Epidermis replaces itself every 15-30 days
12Sweat Glands(Common)
- Classification-Simple coiled tubular
- Secretory Units-Shape like tubules
- Ducts-Unbranched
- Found through out the body
- Most common in forehead
- Begin functioning at birth
A Common sweat gland (duct) B Myoepithelial
cell C Common sweat gland (secretory unit)
13Sweat Gland apocrine(Large)
- Classification-Simple coiled tubular
- Secretory Units-Shape like tubules
- Ducts-Unbranched
- Secretory units much larger than in common glands
14Skin Color (pigment)
- Melanin (yellow-brown-black)
- Carotene (yellow- orange)
- - accumulates in corneum
- Hemoglobin (red)
- Erythema vs. Cyanosis
- -Influenced by blood flow, liver (jaundice)
15Hair
- Derived from skin
- Extends above the skin surface
- Made of Keratin
D Cortex E Medulla
16Hair follicle
17Hair Diseases
- Baldness Loss of hair
- Hair thinning thinning of hair
- Hair graying graying of hair
18Nails
- Highly Keratinized, modified epidermal cells
- Arises from nail bed.
- Rate of growth depends on finger length
19Nail Diagram
20Nail Pathology
21Bibliography
- Jasons Bibliography
- Body Systems
- The Human Body (its structure and operation)
- http//www.exn.ca/human/home.cfm
- http//www.dermnet.org.nz
- http//www.kidinfo.com/health/Human_Body.html
- http//www.dictionary.com
- http//www.medicaldictionary.com/
- Lucianos Bibliography
- How the Body works
- The Human Body
- http//gened.emc.maricopa.edu/bio/bio181/BIOBK/Bio
BookINTEGUSYS.html - http//www.med.sc.edu/hightower/askinnoBG/sld001.h
tm - http//www.anatomy.gatech.edu/aging/skin/tsld001.h
tm