The operative principle: is resection of the superficial jugular vein and the infoding suture of the internal jugular vein, so as to constrict the insidediameterof the blood vessel.
手术原则是颈浅静脉切除，颈内静脉重叠缝合，以缩小血管内径。
2
All groups were sacrificed at tha 7th day after operation and get the basilar arteries (BA) for HE stain. then the perimeter ofinsidediameter and the thickness ofvessel wall were measured.