Integumentary System Latest Update Graded A+

Integumentary System Latest Update Graded A+ integument skin epidermis outermost layer dermis (corium) middle layer of tissue, hair follicles, glands hypodermis deepest layer of skin, full of adipocytes and fat cells keratinized stratified squamous epithelium composes epidermis keratinocytes produces keratin keratin A hard protein material found in the epidermis melanocytes produces melanin melanin a pigment that contributes to skin color and UV protection strata sublayers Thick skin fingertips, palms, soles thin skin covers most of body and has hair stratum corneum outermost layer stratum lucidum translucent layer under s. corneum stratum granulosum deep to s. lucidum in think skin stratum spinosum thicker layer under s. granulosum; cells shrink and are spiny stratum basale (germinativum) deepest layer and adjacent to dermis Come, Let's Get Sun Burned Corneum, Lucidum, Granulosum, Spinosum, Basale avascular no blood vessels papillary layer superficial portion of dermis; contains dermal papilla areolar (loose) connective tissue strands of fibers go in all directions Tactile corpuscles touch receptors dermal papillae dermal tissue extended to epidermis reticular layer consists of dense irregular connective tissue lamellated corpuscle onion thing; deep pressure sensors hypodermis deepest layer of skin superficial fascia hypodermis subcutaneous layer hypodermis adipose tissue fat tissue areolar connective tissue Connective Tissue that contains all three types of fibers, usually arranged in a disorderly fashion (found in the subcutaneous layers of the skin) sudoriferous glands sweat glands eccrine sweat glands in hands feet forehead AKA merocrine merocrine sweat glands in hands feet forehead AKA eccrine apocrine sweat glands found in axillary and anongenital regions shaft above skin hair hair bulb base of hair arrector muscle causes goosebumps sebaceous glands secrete sebum sebum oily substance in follicle of hair nails located on dorsal surface; end fingers and toes partial thickness burn 1st and 2nd degree burn full thickness burn 3rd degree burn Rule of Nines quick estimate of burn percent; arms 9%, head 9%, trunk 18%, legs 18%, genitals 1% First Degree Burn epidermis damage, redness, one week heal, no scar I.E. sunburn Second degree burn epidermis and dermis damage, painful swelling, 2 week heal, scarring third degree burn epidermis and dermis destroyed, hypodermis damage, no pain, skin grating, infection likely Basal Cell Carcinoma common, originates stratum basale, rarely metastasizes, small and shiny on skin surface Squamous Cell Carcinoma stratum spinosum, can metastasize to lymph nodes, lesions, red, scaly appears on head and back of hand Malignant Melanoma deadly, melanocytes of mole, metastasizes quickly and drug resistant ABC Rule A: Asymmetry, B: Border, C: Color, D: Diameter, E: Elevation