Integumentary System Flashcards
what makes up the skin aka integumentary system?
body membranes, nails, hair general sensory receptors, glands
what are the four primary types of membranes?
mucous, serous, cutaneous, synovial
synovial membranes
connective tissue membrane, it lines the fibrous connective tissue in the joints of the skeletal system
mucous membrane
epithelial membrane, lining cavities open to external environment - respiratory tract, GI tract, urinary tract, female reproductive tract
serous membrane
epithelial membrane, no opening to the external environment, lines cavities and covers organs
cutaneous membrane
epithelial membrane, the body’s outer covering, primary organ of the integumentary system (skin)
functions of the skin
protection, temperature regulation, excretion and absorption, general sensory organ, synthesis of vit. D
epidermis
outermost layer of skin, most cells in this layer are keratinocytes (the rest are melanocytes), it contains pores in which glands secrete oil and sweat onto skin’s surface
what causes so many difference shades of skin color and freckles?
the different level of melanin - too much melanin in one area of skin can cause freckles (pigment spots)
what are the ABCD’s of skin cancer?
most common type is basal cell carcinoma, malignant melanoma is more serious, A- assymetry B- border (indistinct and blend in to surrounding skin), C- color (multicolored mix of black/brown/purple), D- diameter (large - 6mm or bigger)
dermis
thicker layer beneath the epidermis, cells in this layer are mostly fibroblasts, divided into the papillary region, and reticular region (deeper, thicker)
hypodermis
aka subcutaneous layer or superficial fascia, made of loose connective tissue containing (adipose tissue - aka fat deposits). this layer insulates the body and stores energy, rich in blood and lymph vessels, nerves and sensory receptors
