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Samenvatting vascularisatie & meningen

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Samenvatting van het zevende hoofdstuk anatomie en fysiologie van de inwendige organen en zenuwstelsel, schijf 1, semester 2: vascularisatie en meningen.

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  • March 29, 2022
  • 8
  • 2021/2022
  • Summary
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Vascularisatie & meningen
1. Vascularisatie
Constant zuurstof nodig in hersenen. Onderbreking bloedstroom → afsterven van hersencellen &
functieverlies




Vanuit aortaboog (hartslagader) ontspringt rechts truncus brachiocephalicus → vertrek van 2 takken
richting heresenen:

• A. carotis communis
o A. carotis interna: geen bevloeiing aan hersenen, maar aan ventrale structuren van
hoofd- & halsgebied
o A. carotis externa: buitenkant van schedel bevloeien (hoofdhuid, tong, keel,
schildklier, hersenvliezen)
• A. vertebralis (ontspringt vanuit a. subclavia)




1

, 1.1 Cirkel van Willis
Bloedtoevoer naar Cirkel van Willis/circulus arteriosus cerebri via 2 routes:

• A.a vertebrales (die samenkomen in a. basilaris)
• A. carotis interna

Van daaruit vertrekken 3 bloedvaten die ook deel uitmaken van de Cirkel van Willis (= cerebrale vaten)

• A. cerebri anterior
• A. cerebri media
• A. cerebri posterior

Hersenen zijn gevoelig voor veranderingen van bloedtoevoer

• Bloedtoevoer onderbroken → bewustzijnsverlies (na 4min: beschadigingen aan zenuwstelsel)
• Verstoringen bloedsomloop zijn zeldzaam, want bloed bereikt hersenen via 2 routes
➔ Maakt collaterale circulatie mogelijk (als één van arteriën geblokkeerd raakt)




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