Integumentary system extra

2 types of body membranes

epithelial & connective tissue membrane

epidermis sublayers

1. stratum corneum

2. stratum lucidum

3. stratum granulosum

4. stratum spinosum

5. stratum basale/germinativum

epidermis cell types

1. keratinocytes

2. melanocytes

3. langerhan cells

4. merkel cells

dermis divided into 2 layers

papillary & reticular layer

skin function

• body temperature regulation

• cutaneous sensation

• metabolic function

• blood reservoir

• excretion

• protection

3 parts of hair

shaft, root, follicle

3 concentric layers

medulla, cortex, cuticle

hair follicle has…

blood vessels, oil/sebceous glands, hair root plexuses, arrector pili

hair root plexuses

nerve endings that are sensitive to touch/ motion

arrector pili

a smooth muslce

if cold/ frightened, brain stimulates to contract & make your hair stand up → goosebumps