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)