integumentary system dermis. 2 layers of skin epidermis – surface layer of skin
Post on 13-Dec-2015
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IntegumentarySystem
Dermis
2 layers of skin
•Epidermis – Surface layer of skin
2 layers of skin
• Dermis – Underlying layer of skin
Skin Layers• Strength of skin in
Dermis– Collagen fibers
• Greek for ‘glue producing’
– Elastic fibers
Skin Layers
• Storage area for water
Dermis Layers
• 2 Layers – – Papillary– Reticular
Dermis – 2 Layers
1. Papillary layer Thinner layer
Dermis – 2 Layers
1. Papillary layer Has Dermal papillae –
finger-like projections into epidermis
Dermal Papillae
1. Papillary layer Papillae ridges– result in
fingerprints Responsible for grip
Dermal Papillae
Dermal papillae
Dermal Papillae
Dermal Layer
2. Reticular layer Network of fibers or
reticulum Thicker layer Used for leather
Dermal Layer
Dermal Layer
Dermal Layer
Dermal Layer
Muscles attach Result: Facial expression
Dermal Layer
Arrector pili muscle Attach to hair follicle
Dermal Layer
During fright – hair stands up Called “skin crawl”
Dermal Layer
Dermal Layer
Dermal layer doesn’t shed
Dermal Layer
Contains sensory receptorsPainPressure (touch)Heat
Dermal Layer
Contains appendages Hair Nail Sweat Sebaceous gland (oil)
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