Summary
Summary INTEGUMENTARY SYSTEM
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Will help you understand the basics of integumentary system.
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Integumentary systemFr Hicanaif sensory
receptors
Mdi consists of
sweatglands
2 layers
Epidermis lthin Dermis thick
outermost deeper
epithelial tissue dense irregular contains
avascular connective tissue collagen elastifyres
Deep to dermis HYPODERMIS not part of skin
subcutaneous
EPIDERMIS
Keratinized stratified squamous epithelium
, cells
keratinocytes mean.at iarmaimammageIaetiie
Intra
01 produce 81 produce epithets
rotein keratin pigment melanin Lagerhans cells detect
participate in touch
I
immuneresponse sensations
keratinocytes have LAMELLAR Granules lipid rich secretion
acts aswater repellant limits entry of foreign material
Newlyformed cells in the stratum basale base layer Of epiderm
are slowly pushed to surface
As cells move from one epidermal layer to next they accumulate
more keratin and this process is called KERATINIZATION
4
layers of epidermis
STRATUM CORNEUM uppermost
STRATUM GRANOLOSUMCKeratinocytesundergo apoptosisher
STRATUM SPINOSUM strength flexibility
x STRATUM BASALE deepest layer
EXCEPTION REMEMBER
For the palms and soles epidermis is made of 5 layers
because thick skin
STRATUM LUCIDUM thick Skin only
b w corneum 4 granulosum
DERMIS deeper part of skin
composed of dense irregular connectivetissue
f
Iastin
collagen
Fibres
, b es
I UPPERMOST layer of Dermis
areolar connective tissue
contains fine elastic fibres
VeryImp
surface area of dermis has finger like
projection called DERMALPAPILLAE
tors
and free nerve
typeof TIE jeep
CORPUSCLES
endings
Deeper part Of dermis consists OF DENSE IRREGULAR
CONNECTIVE TISSUE
cottagers
blue fibres adiposecells hair follicles nerves
oil glands sweat glands
coermist
pigments colours
n
Melanin
Hemoglobin
Carotene
ACCESSORY STRUCTURES
, Accessory structures of skin hair
Protectbody
nails
glands homeostasis
Hair dead keratinizedepidermal cells
shaft
superficial
IT
in dermis
Follicle
Associated with hair are bundles of smooth muscle called
ARRECTORPILI and SEBACEOUSGLANDS Or
OILGLANDS
Sebaceousglands are associated with hair
follicle hence they are absent in palms
and soles because no hair
Sebaceous glands release SEBUM
moistens skin
colour of hair melanin
My
Grey Hair white hair
decline of melanin Accumulation of air
bubbles in hair shaft
Gland group of epithelialcells that
secrete a substance
Glands associated with skin
I
Sebaceous sudoriferous glands ceruminous
glands
glands
releases SEEM Apocrine sweat Eccrine
sweat present in
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