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Integumentary System
The skin and membranes
Body Membranes
• Epithelial MembranesA. CutaneousB. MucousC. Serous
Body Membranes
• Connective A. Synovial
Functions of the Skin
1. Protect
2. Excrete wastes
3. Regulate Body temp.
4. Make Vit. D and protect against UV
Parts of the Skin
• EpidermisA. Corneum –top
layer, dead.
B. Lucindum – keratinonly in feet and hands
C. Granulosum – Middle layer
D. Spinosum – keratinE. Basale – bottom
Cell division
Proteins and Pigments of Epidermis
• Collagen – protein fibers, strengthen skin• Keratin – waterproofs skin• Melanin – pigment, blocking UV rays• Carotene - pigment
Parts of the Skin
• DermisA. Papillary layer• Provide nutrients and • Sensation for epidermis
B. Reticular layer• Glands• Pressure receptors• Phagocytes
Receptors of the Dermis
A. Free Nerve endings - pain
B. Krause’s end bulbs – temp.
C. Meissner’s Corpuscles - touch
D. Pacinian Corpuscles - pressure
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