Integumentary System Anatomy & Physiology Flashcards
Nerve Fibers
Send signal to brain
Grafting
Taking piece of your own skin or donor skin & transplanting it hurts I affected side to grow and repair
What are the three main skin layers?
Epidermis , dermis, and subcutaneous
Epidermis
Outermost layer of skin
Stratum corneum
Surface layer; barrier against infections
Stratum Lucidum
Just below stratum corneum; on palms and soles of feet ONLY.
Provides additional protection for high use areas
Cells appear clear in this layer
Stratum granulosum
The layer cells begin protection process and distributed among layers.
Produces melanin
First layer not to be nourished by dermis
Keratin
Substance that constitutes skin, hair, and nails
Stratum spinosum
“Prickle layer” for spiny texture
Stratum basale
Final & deepest layer; renews epidermal cells
Composed of basal cells
Dermis
Lies under epidermis and is much thicker
“True skin” because contains blood & lymph vessels and nerve fibers
Fibroblast Cells
Produce fibers that help repair injuries
Phagocytic Cells
Protect body by swallowing foreign materials such as bacteria
Mast cells
Contain histamine & heparin
Histamine
Produces allergic reaction
Heparin
Prevents blood clotting
Collagen
Gluey protein in skin, connective tissue, bones, cartilage, tendons, & ligaments
Fibers provide skin with strength and elasticity
Skin can stretch and return to its normal shape again
Stretch marks
Linear marks caused by broken overstretched collagen fibers
Touch receptors
Closer to epidermis so it can detect very delicate surface changes
Pressure receptors
Deeper in epidermis ; why we can press on something firmly without discomfort
Subcutaneous/ Hypodermal
Connective tissue layer that attaches skin to muscles and to other tissues lying beneath skin
Technically NOT part of integumentary system because it’s made of connective tissue
Fascia
Tissue that provides support and protection of organs
Lipocytes
“Fat cells” stored in subcutaneous layer in andipose tissue
Andipose tissue
Made up of adipocytes
What is the sole purpose of lipocytes?
To manufacture and store large quantities of fat
Sweat Gland
Located deep in dermis layer; very close to subcutaneous layer
Eccrine
Numerous, important and widespread through body; tiny coiled tubes reach epidermis through pores
Produce watery sweat
Apocrine
Primarily in axillae ( armpits) and in pigmented skin areas around genitals
Thicker, milky secretion that can be odorous