Willis kumbuthano futhi ezahlukeneyo yokulandelana kwayo ngokohlu

Circle Willis - ukwakheka semithambo yokwakheka, yenziwe yaba yasendaweni ku base zobuchopho, esihlinzeka uhlelo lokuhlelwa kabusha igazi phakathi imibhede semithambo ezahlukene khona enganele igazi ebuchosheni. Kuyinto ipholigoni avaliwe emelela anastomosis semithambo.

kwakhiwa Circle Willis is we front futhi bakhulise yokuxhuma imithambo (PSA futhi SAR), ingxenye yokuqala ngaphambili kanye posterior Umthambo cerebral (PCA futhi PMA) nadklinovidnogo ingxenye yangaphakathi carotid Umthambo (ICA) kanye distal Umthambo basilar (i-OA).

Its anterior ingxenye kwegazi eseduze wenziwa phakathi kohlelo we Umthambo carotid (isibonelo, ICA kanye ACA kwesokudla ethile PSA - ICA kanye ACA ohlangothini kwesokunxele) kanye nesigaba ezingemuva - phakathi ohlelweni we Umthambo carotid futhi uhlelo vertebrobasilar (VSA - SAR - ZMA - OA ).

Kufanele kuqashelwe ukuthi umbuthano ngokuvamile athuthukiswe futhi avaliwe ngokugcwele Willis ihlangana labantu emhlabeni nengxenye kuphela. Kangakanani hypoplasia noma aplasia we PCA futhi PMA, futhi hypoplasia ka PSA futhi SAR. Engxenyeni anterior ka kwezinso Kutholwe engaphansana nje kwengu-anomaly e isakhiwo besigaba labaqaphi elingemuva.

PSA kuyinto ziyahlukahluka kakhulu e oyiyo, usayizi kanye nendawo, kukhona izindlela ezingakhona ezisukela akukho imfundo a fistula ebanzi endaweni contact ACA, kungenzeka kabili noma nakathathu ka PSA. Kakhulu ezingavamile "phambi trifurcation" we anterior Umthambo cerebral: kokubili PMA uqale kwelinye ICA. Kulokhu, kwesiyingi Willis ivuliwe kule anterior. Shiya anomaly ezingavamile kuba phambi ACA ezengeziwe, okuthiwa i Umthambo Wilder.

IKhawuda ngokuvamile atholakala kuphela cishe kwesigamu sabantu emhlabeni. Anomalies hindfoot kungaba ahlukahlukene ngempela: ezinkulu chitha osayizi, kwehlukana quin amagatsha kwemithambo yegazi, noma ngisho engekho izingxenye kwemithambo. I anomaly obujwayelekile umehluko diameters kwemithambo yegazi vertebral: hypoplasia kwesinye nge hypertrophy kanyekanye. Ngesikhathi sigaba okwamanje kukholakala ukuthi omunye umthambo vertebral kuyinto evelele futhi elinye esikhubazayo e umnikelo wabo jikelele emgudwini wegazi umcengezi vertebrobasilar. asymmetry ngokwamukelekayo 50%. Zsa ububanzi ngokuvamile kancane esingaphansi PSA. Kuyinto evamile nokuba ngempela hypoplasia SAR.

Okufana kwesiyingi Willis - anomaly evelele isakhi intracranial uhlelo vertebrobasilar: akukho ubunye okuphelele imithambo vertebral nhlangothi zombili umfula oyinhloko anastomoses kabi okungenzeka isakhiwo noma imithambo awavikelekile. Endabeni le basilar Umthambo aplasia noma i-SAR elakhiwe hindfoot VULA lwemithambo cerebral mbuthano. Kuyinto kusukela ezingemuva amagatsha perforating uphokophele medium futhi ephakathi. It kuvela ukuthi umbuthano evulekile Willis kungaba ingxenye anterior, futhi emuva. Futhi angavulwa ngokuphelele (akukho umthambo elihlangana) kanye aziphelele (at hypoplasia noma ukuvaleka).

Izinguquko ku isakhiwo evamile cerebral lwemithambo umbuthano kungaba azalwa naso noma bathenga - umphumela ezithile lithathelwe izimo esishintshile hemodynamics e pathologies ezihlukahlukene izitsha eyinhloko ekhanda, ngokuvamile ukuthuthukisa kulezi zimo. Ukuhlolwa izici ezithile kule nokwakheka embhedeni semithambo wenziwa ngokuvumelana angiography futhi kubaluleke kakhulu practice zezinzwa. Kuyadingeka ukuba ukuhlukanisa sitholakele izinguquko imithambo: iyini imbangela ezikhula ngenxa izinguquko sokugembula.