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Samenvatting Histologie - Bot/Been

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Samenvatting van het hoofdstuk bot/been uit cytologie en histologie. Examentips. Notities en extra info uit de les zijn in de samenvatting verwerkt

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Summarized whole book?
No
Which chapters are summarized?
H4 been
Uploaded on
February 7, 2020
Number of pages
9
Written in
2019/2020
Type
Summary

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Been
 Rijk aan anorganische kristallen
 Bloedvaten en zenuwen aanwezig
 Metabool actief / permanent geremodelleerd
 Ingewikkelde structuur
 Variatie naargelang locatie


Compact been: zonder holten
Spongieus bot: botbalkjes en holten


Botweefsel

 Haverse systemen met haverse kanalen = opening met bindweefsel, met bloedvaten,
zenuwen en lumfe
 Canaliculi


 Primair of plexiform bot
o Osteocyten uniform verspreid (zonder spec orientatie)
o Collageenvezels in verschillende richtingen


 Secunair of lamellair bot
o Uit lamellen
o In compact bot
- Osteonen of Haverse systemen/kanalen
- Cilindervormige lamellen concentrisch georg rond Haverse kanalen en
samengekit door botcement
- Bevatten bloedvaten en zenuwen
- Kanalen verbonden met andere Haverse kanalen of beenmerg
- Dwarsverbindingen het kanalen van Volkman

o Haverse systemen = osteonen
- Tussen osteonen: interstitiële lamellen
- Rond geheel van verschillende osteonen met
interstit lamellen: omgeven hele cortex
- Buitenzijde = periose = bindweefsel
- Binnenzijde = endost = bindweefsel

, Samenstellende componenten

 Botcellen – zoals in kraakbeen
o Osteoblasten (maken bot aan)
o Osteocyten (maken bot aan)
o Osteoclasten (breken bot af)

 Extracellulair materiaal
o Collageenvezels
o Grondstof




Osteoblasten en osteocyten

 Afkomstig van osteoprogenitorcellen => populatie van cellen uit mesenchym gelegen tegen
botopp in binnenlaang van periost en endost

 Osteoblasten
o Vezelvorming en ossificatieproces
o Bij osteosynthese: kubisch tot cilindrisch
o Liggen in aaneengesloten rijen
o Kern
- Groot met perifere nucleool
o Cytoplasma
- Veel RNA
- Produceren tropocollageen en GAG = glycosaminoglycanen

 Differentiatie tot platte cellen met veel uitlopers tijdens aanmaak osteoid
 Vele kleine granules: calcoferieten, sferulieten of matrixgranulen

 Mineralisatie
o Collageenvezels
- Naaldvormige hydroxy-apatietkristallen op regelmatige afstand op
collageenfibrillen in grondstof

o Osteoblasten
- Door alkalische fosfatase-activiteit: stijging Ca2+ en PO4- concentratie versnelling
mineralisatieproces
- Osteoblasten ingemetst
- Na ossificatie = osteocyt
- Verbinding botcellen via canaliculi (voeding)
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