Willis denderedzwa uye dzakasiyana kwayo mamiriro

Circle of Willis - a vascular anatomical inotungamirwa, vemunyika pamusoro mujinga uropi, chinopa redistribution ropa pakati vascular yakasiyana mibhedha pamberi kukwana ropa wedzerai muuropi. Zviri namahwindo polygon rinomiririra vascular anastomosis.

Denderedzwa Willis achiumbwa pamusoro mberi uye neshure unobva arteries (Mapisarema uye SAR), kutanga chidimbu nechemberi uye posterior chepfungwa tsinga (PCA uye PMA) nadklinovidnogo chidimbu chezvinhu womukati carotid tsinga (ICA) uye distal basilar tsinga (OA).

Its Anterior chikamu rubatso riparadzirwe rinoitwa pakati hurongwa ari carotid tsinga (somuenzaniso, ICA uye ACA zvakanaka side- Mapisarema - ICA uye ACA akasiya divi) uye rwemberi chikamu - pakati ezvinhu ari carotid tsinga uye vertebrobasilar system (VSA - SAR - ZMA - OA ).

Zvinofanira kucherechedzwa kuti anowanzoitwa yakatanga uye zvakazara namahwindo yakaurungana Willis anosangana vepasi chete hafu. Hwakapararira hypoplasia kana aplasia pamusoro PCA uye PMA, uye hypoplasia pakati Mapisarema uye SAR. Muchikamu Anterior chikamu abnormalities padzakacherechedza zvishoma pane imwe anomaly mu sechivako rwemberi kupesana.

Psa zvikuru shanduka wayo chimiro, ukuru uye nzvimbo, zvinogoneka nzira kubvira hapana dzidzo navanopinda fistula pa nzvimbo kunyorerana ACA, zvingadarowo doubling kana tripling yacho Psa. Very rova "trifurcation pamberi" ari Anterior chepfungwa tsinga: vose PMA kutanga imwe ICA. Panyaya iyi, mudenderedzwa Willis rakazaruka riri Anterior. Zvikuru isingawanzowanikwi anomaly ndiyo kuvapo mamwe ACA, unonzi imwe tsinga Wilder.

Kaudha anowanzoita kuwanikwa chete inenge hafu yevagari vepasi pose. Anomalies hindfoot inogona kunyatsonanga siyana: guru paradzira hukuru, asymmetric siyana pakati mapazi arteries, kana kunyange kusavapo mapazi eumambo arteries. The inonyanya anomaly ndiyo musiyano iri diameters pamusoro vertebral arteries: hypoplasia mumwe chete mawa hypertrophy. Panguva ino Danho zvinonzi vaidavira kuti chimwe vertebral tsinga ndihwo uye mumwe recessive mu mupiro hwadzo kuti muropa vertebrobasilar bheseni. Zvinogamuchirwa asymmetry 50%. ZSA mu dhayamita rinowanzova zvishoma zvishoma pane Psa. Uyewo zvakajairika mazuva hypoplasia SAR.

Musiyano pakati mudenderedzwa Willis - raidudzwa STRUCTURAL anomaly pakati intracranial vertebrobasilar ezvinhu: hapana kubatana pakati vertebral arteries panhivi mbiri huru tsinga kwakakwana anastomoses zvichibvira kushandisa nemamiriro kana arteries vari voga. Kana ari basilar tsinga aplasia kana SAR wakadenha VHURA hindfoot chepfungwa arterial denderedzwa. Hazvina kubva rwemberi perforating mapazi mune vavariro svikiro uye midbrain. Zvakaratidza kuti rakazaruka mudenderedzwa Willis anogona kuva Anterior chidimbu, uye kumashure. Uye rinogona kuvhurwa zvachose (hapana coupling tsinga) uye kukwana (nenguva hypoplasia kana aienda).

Zvakachinja dzose urongwa cerebral arterial denderedzwa vangava vachiberekwa kana vawana - mugumisiro zvimwe zvikamu kwadzakabva kusvika achinja ezvinhu hemodynamics mu pathologies siyana huru nhumbi musoro, izvo kazhinji munguva muzviitiko izvi. Kunyatsoongorora zvinhu chaizvo zvechiratidzo vari nemamiriro vascular pamubhedha rinoitwa maererano angiography uye kwakakosha munyika chetsinga tsika. Zvakakodzera kusiyanisa zviri nechirwere nezvokuchinja arteries: chii chikonzero uye kuva somugumisiro Kumwe kuchinja kunotanga.