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Integumentary Concept Map-Elena Martinez , - Coggle Diagram
Integumentary Concept Map-Elena Martinez
Skin
Protective covering; prevents many substances and pathogenic
microorganisms from entering body
• Protection of underlying tissues
• Houses sensory receptors
• Conducts part of the process for making vitamin D
• Body temperature regulation, via sweat gland activation, and
vasodilation or vasoconstriction of dermal blood vessels
Healing of wounds
Involves the formation of a blood clot from the released
blood
• The blood clot and dried tissue fluids form a scab to cover the
wound
• Extensive collagen fiber production in the area may for an
elevated area called a scar
Nail
Protective coverings over the ends of fingers and toes
• Consist of a nail plate overlying a layer of skin surface, called
the nail bed
• Lunula: half-moon-shaped structure at base of nail plate;
most actively growing region of the nail root
• As new cells are produced, older ones are pushed outward
and become keratinized, just as in other parts of the skin
Hair
Hair can be found in nearly all regions of the skin except
palms, soles, lips, nipples, and portions of external genitalia
• Each hair develops from epithelial stem cells at the base of a
tube-like depression called the hair follicle
• Hair follicles dip down into the dermis or sometimes the
subcutaneous layer
• The deepest part of the hair root is called the hair bulb; it is
located at the base of the hair follicle
• As new cells are formed in the bulb, old cells are pushed
outward and become keratinized, and die forming the hair
shaft
• Hair is composed of dead, keratinized epithelial cells