Embryogenesis of cns blood vessels A201 Embryogenesis of cns blood vessels



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Embryogenesis of CNS blood vessels

Last updated: February 18, 2016


CNS kraujagyslės vystosi iš neural tube supančios mezenchimos;

  • pradžioje tai random network of coalescing channels.

  • vėliau dalis kanalų nyksta, dalis vystosi toliau – išryškėja viena stambi išilginė arterija, einanti per visą neuraxis ilgį – ventral median artery (this artery splits and reunites rostrally).


d:\viktoro\neuroscience\a. neuroscience basics\a201-211. vascular\00. pictures\na396(15-1) arterial development.jpg

Ventral median artery receives blood:

  1. at spinal levels – from somite arteries (branch regularly from aorta)

  2. at cerebral level – from carotid and vertebral arteries; brain stem šiek tiek mitybos gauna ir iš branchial arches arterijų (per kranialinių nervų kamienus).


Ventral median artery šakos:

  1. Paramedian arteries – atsišakoja stačiu kampu ir iš karto perforuoja neural tube.

  2. Circumferential arteries (circumnavigate neuraxis and send perforating branches):

    1. short circumferential arteries

    2. long circumferential arteries – gaubia cerebral & cerebellar hemispheres dar prieš pasibaigiant fissuration (t.y. dar neprasidėjus sulcation) – vystantis žievės paviršiui, arteries follow contour of cortical surface.

d:\viktoro\neuroscience\a. neuroscience basics\a201-211. vascular\00. pictures\na396(15-2) ventral arterial channel.jpg
d:\viktoro\neuroscience\a. neuroscience basics\a201-211. vascular\00. pictures\na397(15-3).jpg

Anatomical Variants

Fenestration

(differs from duplication!) - persistent segment of embryonic intersegmental arteries (hypoglossal or proatlantal).



  • usually asymptomatic.

  • most fenestrations (>70%) are extracranial and occur at C1-C2 level.

Hypoglossal nerve traversing fenestrated right vertebral artery, just proximal to vertebrobasilar junction:





Bibliography for ch. “Vascular” → see Vas1 p.

Viktor’s Notes℠ for the Neurosurgery Resident



Please visit website at www.NeurosurgeryResident.net


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