Willis da'irar da kuma bambance-bambancen karatu na da tsarin

Circle of Willis - a jijiyoyin bugun gini ilimin Halittar Jiki samuwar, sarrafa a kan tushe na kwakwalwa, wanda ya samar da wani redistribution na jini tsakanin daban-daban jijiyoyin bugun gini gadaje a gaban kasa jinin samar da kwakwalwa. Shi ne rufaffiyar polygon wakiltar jijiyoyin bugun gini anastomosis.

Circle of Willis an kafa na gaba da raya a haɗa arteries (PSA da SAR), da farko kashi na gaba da na baya cerebral jijiya (PCA da PMA) nadklinovidnogo kashi na ciki carotid jijiya (ICA) da kuma distal basilar jijiya (OA).

Its agara kashi na tabbaci wurare dabam dabam ne da za'ayi tsakanin tsarin na carotid jijiya (misali, ICA kuma ACA dama side- PSA - ICA kuma ACA bar gefen) da kuma raya sashen - tsakanin tsarin na carotid jijiya da kuma vertebrobasilar tsarin (VSA - SAR - ZMA - OA ).

Ya kamata a lura da cewa kullum ci gaba da kuma cikakken rufaffiyar da'irar Willis gana kawai rabin adadin jama'a na duniya. Tartsatsi ne hypoplasia ko aplasia na PCA da PMA, kuma hypoplasia na PSA da SAR. A cikin agara kashi na munanan gano kadan kasa da wani anomaly a cikin tsarin da raya division.

PSA ne sosai m a cikin tsarin, size da wuri, mai yiwuwa ne zabin jere daga wani ilmi to fadi da fitsari a shafin na lamba ACA, shi ne kuma zai yiwu maimaitawan ko tripling na PSA. Very rare "gaban trifurcation" na cikin agara cerebral jijiya: duka biyu PMA fara a daya daga cikin ICA. A wannan yanayin, cikin da'irar Willis ne bude a cikin agara. Quite rare anomaly ne gaban ƙarin ACA, wanda aka kira wani jijiya Wilder.

Cauda kullum samu ne kawai a game da rabin adadin jama'a na duniya. Anomalies bayan kafa na iya zama quite bambancin: manyan watsa masu girma dabam, asymmetric bambanta rarrabuwar daga cikin rassan da jijiyoyi, ko ma babu segments na jijiya. Mafi na kowa anomaly ne bambanci a diameters na vertebral arteries: hypoplasia da juna tare da lokaci daya hypertrophy. A halin yanzu mataki shi ne ya yi ĩmãni da cewa daya vertebral jijiya shi ne rinjaye da kuma sauran ne recessive a cikin sauran taimako ga jini vertebrobasilar tasa. M jeri na bangaren na 50%. ZSA a diamita ne yawanci dan kadan kasa da PSA. Shi ne kuma quite na kowa hypoplasia SAR.

Bambance-bambancen da da'irar Willis - pronounced tsarin anomaly na intracranial vertebrobasilar tsarin: babu wani cikakken daidaituwa na vertebral arteries a garesu daga cikin manyan jijiya anastomoses yiwu rashin amfani da tsarin, ko da jijiyoyi ne ya zama ruwan dare. A cikin hali na basilar jijiya aplasia ko SAR generated OPEN bayan kafa cerebral jijiya da'irar. Shi ne daga raya na perforating rassan je a cikin matsakaici da kuma midbrain. Sai dai itace cewa da bude da'irar Willis iya zama a cikin agara kashi, kuma a baya. Kuma shi za a iya bude gaba daya (babu hada guda biyu jijiya) da kuma bai cika ba (a hypoplasia ko takaita).

Canje-canje a cikin al'ada tsarin da cerebral jijiya da'irar iya zama ko dai nakasar ko samu - sakamakon wasu sassa na karbuwa ga sauya yanayin hemodynamics a daban-daban pathologies daga cikin manyan tasoshin na kai, wanda sau da yawa ci gaba a cikin wadannan lokuta. Evaluation na musamman siffofin a cikin tsarin da jijiyoyin bugun gini gado ne da za'ayi a cewar angiography kuma yana da muhimmanci sosai a neurological yi. Wajibi ne a rarrabe, a cikin ganewar asali da canje-canje a cikin jijiyoyi: abin da yake a cikin hanyar da wanda ci gaba a sakamakon pathological canje-canje.