skin and the integumaentary system

main functions of the integumentary system

protects inner organs (from invasion by microorganisms and dna damage caused by UV), prevents dehydration, acts as sensory organ, maintains temp., underlying hypodermic, STORES FATS.

epidermis

region of integumentary system that is avascular (no blood vessels), thinnest, most superficial layer

dermis

region of the integumentary system that is well-vascularized,contains components associated with SKIN FUNCTION

hypodermis (hypo=below)

region of the integumentary system that is well vascularized, loose connective tissue which anchors it to underlying structures

thick skin - epidermis

• contains 5 layers: includes STRATUM LUCIDUM

• appearance: FRICTION RIDGES - tire threads, prints

• function sensation, manipulation of objects

• located in PALMS of hands and SOLES OF FEET

thin skin - epidermis

• contains 4 layers: stratum lucidum is ABSENT

• appearance: smooth with irregular grooves

• function: NORMAL SKIN function

• located in most areas throughout body

basal cell

cell of epidermis that is a cuboidal stem cell in the stratum basale that produces keratinocytes

keratinocyte

cell in the STRATUM SPINOSUM and above that manufactures and stores the protein keratin and water-repelling glycolipid that helps prevent water loss from the body