Layers of the Epidermis A_M1

13 cards·by jennybakalov

components of the integumentary system

cutaneous membrane, accessory structures, subcutaneous layer, and cutaneous plexus

cutaneous membrane

epidermis and dermis

epidermis

the very top layer of the cutaneous membrane

dermis

papillary layer and reticular layer

subcutaneous layer (hypodermis)

located below the cutaneous membrane

accessory structures

hair shaft, pore of sweat gland duct, tactile compuscle, sebaceous gland, arrector pili muscle, sweat gland duct, hair follicle, etc

cutaneous plexus

artery and vein

the five layers of the epidermis

stratum corneum, stratum lucidum, stratum granulosum, stratum spinosum, and stratum basale

stratum corneum

multiple layer of flattened, dead, interlocking keratinocytes; typically relatively dry; water resistant but not waterproof

stratum lucidum

appears as a glassy layer in thick skin only

stratum granulosum

keratinocytes produce keratohyalin and keratin; keratin fibers develop as cells become thinner and flatter

stratum spinosum

keratinocytes are bound together by maculae adherens attached to tonofibrils of the cytoskeleton; some keratinocytes divide in this layer

stratum basale

deepest, basal layer; attachment to basal lamina; contains epidermal stem cells, melanocytes, and Merkel cells