cartilage tissues
DESCRIPTION
HistologyTRANSCRIPT
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CARTILAGE
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• Cartilage is a form of connective tissue
composed of cells called
CHONDROCTE! and a "ig"l#
speciali$ed e%tracellular matri%
• & '() of cartilage volume consists of t"e
e%tracellular matri% *"ic" is a functional
element of t"e tissue
• C"ondroc#tes are essential participants inproducing + maintaining t"e matri%
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T#pes
• HALINE
, C"aracteri$ed -# matri% containing t#pe II
collagen fi-ers. gl#cosaminogl#cans /GAGs0.
proteogl#cans + multiad"esive gl#coproteins
, Distinguis"ed -# "omogenous amorp"ous
matri%
, Appears glass# in living state , T"roug"out t"e cartilage matri% are spaces
are spaces called LAC1NAE
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T#pes
• HALINE
, *2in t"e lacunae are c"ondroc#tes
, 3rovides a lo* friction surface. participates in
lu-rication in s#novial 4oints. and distri-utes
applied forces to t"e underl#ing -one
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5 molecules in "#aline cartilage
matri%
• Collagen molecules
• 3roteogl#cans
• 6ultiad"esive gl#coproteins
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Collagen 6olecules• 6a4or matri% protein
T#pe II collagen Constitues t"e -ul7 of fi-ril
T#pe I8collagen
9acilitates fi-ril interaction *2 matri%proteogl#can molecules
T#pe 8Icollagen
Regulates t"e fi-ril si$e
T#pe 8 collagen Organi$es collagen fi-rils into a 5:dimensional "a%agonal lattice
T#pe ;Icollagen
Also found in matri%. mainl# at perip"er# ofc"ondroc#tes *"ere it "elps attac" t"esecells to matri% frame*or7
I n v o l v e d i n f
o r m a t i o n
o f m a t r i x f i b
r i l s
* II, VI, IX, X, XI : cartilage specific collagen
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3roteogl#cans
• Contains gl#cosaminogl#cans
, H#aluronan
, C"ondrotin sulfate forms a proteogl#can
, <eratin sulfate monomer
• 6ost important monomer is aggrecan
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6ultiad"esive Gl#coproteins
• Also referred to as non:collagenous +
non:proteogl#can lin7ed gl#coproteins.
influence interaction -et*een
c"ondroc#tes + matri% molecules + value
as mar7ers of cartilage turnover and
degeneration
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T#pes
• HALINE
, H#aline cartilage matri% is "ig"l# "#drated to
provide diffusion of small meta-olites +
resilience
, H=C= provides a model for t"e developing
s7eleton of fetus
, A firml# attac"ed connective tissue. t"eperic"ondrium surrounds "#aline cartilage
, H=C= of articular 4oint surfaces do not possess
a peric"ondrium
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T#pes
• ELA!TIC
, Distinguis"ed -# t"e presence of elastin in
cartilage matri%
, 9ound in e%ternal ear. *alls of e%ternal
acoustic meatus. t"e auditor# /eustac"ian0
tu-e. + epiglottis of t"e lar#n%
, 6atri% of elastic cartilage do not decalcif#upon aging
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T#pes
• 9I>ROCARTILAGE
, Consists of c"ondroc#tes + t"eir matri%
material in com-ination *2 dense connective
tissue
, Com-ination of dense connective tissue +
"#aline cartilage
, No surrounding peric"ondrium
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T#pes
• 9I>ROCARTILAGE
, T#picall# present in interverte-ral dis7s.
s#mp"#sis pu-is.articular dis7s of
sternoclavicular + temporomandi-ular 4oints.triangular fi-rocartilage of *rist. + anatomic
locations *"ere tendons attac"ed to -ones
, 3resence of fi-rocartilage indicates resistanceto -ot" compression + s"earing forces
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T#pes
• 9I>ROCARTILAGE
, E%tracellualar matri% of fi-rocartilage is
c"aracteri$ed -# presence of -ot" t#pe I + II
collagen fi-rils
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C"ondrogenesis + Cartilage Gro*t"
• 6ost cartilage arise from mesenc"#meduring c"ondrogenesis /cartilage
development0
• ? 7inds of gro*t"@ , Appositional , process t"at forms ne*
cartilage at surface of an e%isting cartilage
, Interstitial , process t"at forms ne* cartilage*2in an e%isting cartilage mass
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Repair of H#aline Cartilage
• H=C= "as limited a-ilit# for repair • "en H=C= calcifies. it is replaced -# -one
in t"e ff situations@
, T"e portion of articular cartilage t"at is incontact *2 -one tissue in gro*ing adult -ones.
-ut not t"e surface portion is calcified
, Calcification al*a#s occurs in cartilaget"at is
a-out to -e replaced -# -one during t"egro*t" period of individual
, H=C= in adult calcifies in time as part of aging
process
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H#aline Cartilage
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Elastic Cartilage
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9i-rocartilage