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Skin

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by

erin walder

on 16 February 2013

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Transcript of Skin

By: Erin Walder Integumentary System Epidermis Dermis Skin Conditions We May Observe Protection
Absorption
Secretion
Sensation
Excretion
Regulation
Got Thin Skin?? 25 times thicker than epidermis Acne Epidermis
Dermis
Subcutaneous Layer Hair
Nails
Nerves
Arrector Pili
Sweat Glands
BloodVessels
"Corny, Horny Layer" Corneocytes=
Keratinocytes sentenced
to death! on palms and soles Densely packed clear keratin Thickest "Grainy" Keratinization where protection begins.. "Spiny" First line protection from infection, external contact, and dehydration Desmosomes between cells provide strength and support Langerhans Cells aka Germinativum Continual Mitosis Hemidesmosomes connect epidermis to dermis 25-30 Day Cycle Merkel Cells = Sensory Receptors for light touch Melanocytes: Skin Color; Protect keratinocytes from UV Rays "True Skin" Main Function: Structure Fibroblast cells: form fibers and help create collagen and elastin Strong Protein
70% of Dermis
Structure, Strength, and Healing Fibrous Protein
Basis of what forms elastic tissue Stretch/Elasticity
Scars and Stretch Marks can destroy elastin fibers Mast Cells: Release Histamines Two Layers: Papillary Dermis and Reticular Dermis Dermal Layers Meissner's Corpuscles: light pressure and cold
Ruffini's Corpuscles: long-term pressure and heat
Pacinian Corpuscles: Deep pressure and pain
Krause's End Bulbs: Pressure and Pain (Sudorifeous) Apocrine
Eccrine Papillary and Reticular Dermis Produce Sebum Lots of blood cells
Nourishes Epidermis Collagen and Elastin Fibers Subcutaneous Layer Adipose Tissue and Loose Connective Tissue Parts of the sweat glands and nerves Contour and Shape Emergency Reservoir Separates skin from muscle Appendages Covers and Protects Cancer Herpes Simplex HPV Impetigo Wrinkles
Full transcript