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Chapter 4
Exam 1
39
Anatomy
Undergraduate 1
02/04/2011

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Term
functions of integumentary system
Definition
physical protection, excretion, storage of lipid reserves, synthesis of vitamin D3, sensory info
Term
epidermis
Definition
stratified squamous epithelium containing cells that eventually undergo keratinization
Term
dermis
Definition
layer of CT under epidermis
Term
thick skin __ layers
Definition
5; found on palms and soles of feet
Term
thin skin __ layers
Definition
4; stratum lucidum is missing and is found everywhere else
Term
stratum corneum
Definition
basket-weave pattern
Term
stratum lucidum
Definition
clear layer, hard to see cells, only in thick skin
Term
stratum granulosum
Definition
keratohyaline granules appear
Term
stratum spinosum
Definition
cells have spiny edges
Term
stratum germinatuvum or basale
Definition
1 cell thick; mitosis of basal cells; produces new keratinocytes
Term
four types of cells in epidermis
Definition
keratinocytes, melanocytes, merkel cells, langerhans cells
Term
keratinocytes
Definition
found in all layers, most abundant in epidermis, eliminate all organelles and becomes keratinized
Term
melanocytes
Definition
found only in stratum basale, pigment producing, protection from UV
Term
Merkel cells
Definition
found only in stratum basale, contains nerosecretory granules
Term
langerhans cells
Definition
found mainly in stratum spinosum, phagocytic, antigen presenting cells, immune response
Term
two layers of dermis
Definition
papillary layer (blood vessels, lymphatics, sensory neurons)and reticular layer
Term
reticular layer
Definition
ticker bundles of collagen, resists tension (deeper in dermis)
Term
papillary layer
Definition
superficial layer of dermis
Term
Langer's lines
Definition
lines of cleavage follow lines of tension
Term
dermis contains
Definition
blood vessels and nerves
Term
free endings
Definition
pain
Term
pacinian
Definition
vibration or deep pressure
Term
meissner
Definition
light touch
Term
accessory or ___ structures
Definition
adnexal
Term
two types of sweat glands
Definition
merocrine (eccrine) and apocrine
Term
hair follicle
Definition
keratinized filaments that develop from an invagination of the epidermis
Term
three layers of hair
Definition
medulla (center), cortex (surrounds medulla), cuticle (extermal to cortext)
Term
arrector pili muscles
Definition
elevate hairs
Term
four types of hair
Definition
lanugo, vellus, intermediate, terminal
Term
anagen
Definition
growth phase; 85% of hair is in this; 2-5 years
Term
catagen
Definition
down regulation phase; one-two weeks
Term
telogen
Definition
resting phase; five to six weeks; 10-15% of all hair
Term
sebaceous glands
Definition
upper third of hair follicle
Term
sebum
Definition
oily substance discharged into hairs
Term
sebaceous follicles occur
Definition
on the face.... not associated with hair follicles
Term
appocrine sweat glands found where?
Definition
axilla and groin, produce secretion that produces odor
Term
merocrine (eccrine)sweat glands
Definition
found almost everywhere; produces sweat
Term
hyponychium
Definition
under free edge of nail body
Term
cuticle and hyponychium derived from
Definition
stratum corneum layer
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