integumentary system

what is function of the integumentary system

protection

thermoregulation

synthesis of hormones

what are the organs of the integumentary system

skin, nails, hair, sweat glands, sebaceous glands, mammary glands

functions of the epidermis

protects dermis

controls skin permeability

protects from pathogens

synthesize vitamin D

sensory receptors

thick skin

palm, sole (5 layers)

thin skin

eye lid

no staum lucidum layer

what are the two layers of the dermis

papillary and reticuular

papillary layer of the dermis

nourishes and supports epidermis (more superficial)

reticular layer

restricts spread of pathogens

stores lipids

attaches skin to deeper tissues

sensory receptors

accessory structures

hair follicules, exocrine glands, nails

what are the 5 layers of skin

• Stratum basale (most deep)

• Stratum spinosum

• Stratum granulosum 

• Stratum lucidum

  • Stratum corneum (most superficial

dermal ridges

stratum basale

ridges extend into the dermis

tension lines

lines that mark the way the body moves

how are collagen and elastic fibers organized

parallel pattern

keratinocytes

produce keratin

soaks up water to improve grip in water

Found in stratum spinosum, stratum granulosum, stratum corneum

melanocytes

produces melanin

found in stratum spinosum

merkel cells

sensory cells

found in stratum basale

langerhans cells

garbage cans

macrophages

Found in stratum spinosum