Upload
zahi
View
30
Download
0
Tags:
Embed Size (px)
DESCRIPTION
The Integumentary System . Chapter 6. Layers of Skin - Epidermis. outside. Epidermis is the outermost main layer of the skin The epidermis has 5 sub layers stratum corneum stratified squamous epithelium 20 layers of dead cells - very flat mostly keratin (protein) - PowerPoint PPT Presentation
Citation preview
The Integumentary System Chapter 6
Layers of Skin - Epidermis• Epidermis is the
outermost main layer of the skin
• The epidermis has 5 sub layerso stratum corneum
stratified squamous epithelium
20 layers of dead cells- very flat
mostly keratin (protein) normally the body sheds
thousands per day
outside
inside
Layers of Skin - Epidermis• The epidermis has
5 sub layerso stratum lucidum
four layers at the top on palmar and plantar surface only
o stratum granulosum essentially dead cells lysosomes have
destroyed almost all organelles
outside
inside
Layers of Skin – Dermis
• Middle main layer beneath the epidermis
• Composed mostly of connective tissue
• Location rich in collagen, a structural protein
Layers of Skin – Dermis• Components of the dermis
o blood vesselso nerves
• hair follicles• glands
Layers of Skin – Dermis
• Dermal papillaeo finger-like projections of
the dermis into the epidermis
o rich in blood supply = blood and nutrients
o zone of temperature regulation
Layers of Skin – Dermis• Dermal papillae
o Fingerprints - dermal friction ridges are a result of patterns of dermal papillae (epidermal ridges)
Layers of Skin – Subcutaneous fascia (layer)• Adipose is stored
here - energy storage in locations called subcutaneous fat pads
• The loose arrangement allows for skin movement
• Adipose is needed for insulation from heat loss
Layers of Skin – Subcutaneous fascia (layer)• Adipose is needed for insulation from heat
loss