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The integumentary System Function
Protection, Contains sensory receptors, production of vitamin D, regulation of body temperature, excretion and absorption (minor role).
Epidermis
Outermost layer of the skin. It acts as the body's major barrier against the environment.
Layers that make up Epidermis
Stratum Corneum; Stratum Lucidum; Stratum Granulosum; Stratum Spinsosum; Stratum Basale
Dermis
The second/middle layer of skin. The area of supportive connective tissue between epidermis and subcutis. Contains sweat, glands, hair roots, nervous cells and fibres, blood and lymph vessels.
Layers that make up Dermis
Papillary Layer: Thin outer layer of areolar connective tissue; Reticular Layer: thick layer of dense irregular connective tissue which makes up most of dermis.
Hypodermis
The hypodermis (subcutaneous layer) lies between the dermis and underlying tissues and organs.
Functions of Hypodermis
It provides thermal insulation, and absorbs shocks from impacts to the skin.
Skin and Functions
Considered an organ and provides a layer of protection from pathogens, physical abrasions, and radiation from sun. Also helps maintain homeostasis.