GB31 풍시 (風市)
GB   족소양담경

부위
넓적다리 가쪽면, 양팔을 넓적다리에 나란히 늘어뜨리고 똑바로 섰을 때, 가운데손가락 끝이 닿는 엉덩정강근 막띠(iliotibial band) 뒤쪽의 오목한 곳.

On the lateral aspect of the thigh, in the depression posterior to the iliotibial band where the tip of the middle finger rests, when standing up with the arms hanging alongside the thigh.
취혈
무릎을 약간 굽히고, 저항에 대항하며 엉덩이를 외전시켜, 먼저 엉덩정강근막띠를 찾고, 風市(GB31)를 취혈한다.

Note: GB31 is located by first finding the iliotibial band when the knee is slightly flexed and the hip is abducted against resistance.
침구법
- 直刺 0.5~1.5寸
- 斜刺 0.7~1.5寸