Integumentary System

4 parts of the integumentary system

hair,nails,glands,skin

Largest organ? Dermatology?

Skin covering 22 sq ft + 11lbs, science of diagnosing and treating skin disorders

epidermis

outer layer of skin which is thinner

dermis

inner layer of skin which is thicker

subcutaneous layer / superficial fascia

loose adipose tissue beneath dermis, attaching skin to underlying tissues and organs

5 layers of skin —> Top to bottom —— Epidermis

Stratum corneum, Stratum lucidum, Stratum granulosum, Stratum spinosum, Stratum basale

What are the 7 functions of the skin

regulate body temp, protection, sensation, excretion, blood reservoir, synthesis of vitamins, immunity

Functions of each 5 layers of skin —→ Top to bottom

1. dead cells at top, replaced every 2-4 weeks

2. cells begin to die as they move up w/o bloody supply

3. cells accumulate more keratin as moving upward

4. cells move upward as newer cells are produced

5. newly formed cells in basale layer begin to produce keratin*fiberous protien*

Epidermis skill called? 

stratified squamous epithelium

Dermis?

composed of connective tissue containing collagen, contains blood vessels, nerves, glands

sebaceous glands

oil glands found in dermal layer everywhere except palm and soles

sebum

oily secretion, keeps hair moist and skin, reduces bacteria

acne

infected gland and developed into pimples and boils

sudoriferous glands

sweat glands

eccrine glands

found everywhere except lips, nail beds, found on palms and soles

merocrine glands

found in pubic and axillary, nipple regions