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Ch. 6 Integumentary System (Epidermis (keratinized stratified squamous…
Ch. 6 Integumentary System
Epidermis (keratinized stratified squamous epithelium)
S. Corneum
20-30 layers, plasma membrane
Keratinocytes (melanin pigment)
S. Lucidum
Thick skin
Not thin skin (hair follicle, sweat glands)
S. Granulosum
4-6 layers, keratinization begins, cells die
S. Spinosum
Several layers, keratin desmosomes, melanocytes, dendritic cells
Immune function
Stratum Basale
One layer stem cells, some melanocytes (make melanin), tactile cells, pain receptors
Pl. strata
Dermis (connective tissue)
Stratum Germinativum
Papillary layer
Areolar connective tissue
Reticular layer
Dense irregular connective tissue
Hypodermis (subcutaneous, superficial fascia)
Areolar connective tissue
Not a part of the integument
Adipose connective tissue
Structures (epidermal derivatives)
Hair
Dead, keratinized epithelial cells
Nails
Dead, keratinized epithelial cells
Exocrine glands
Living epithelial cells
Merocrine, apocrine
Sweat
Sebaceous
Sebum
Ceruminous
Cerumen (earwax)
Mammary
Milk