Its shape is slightly convex in the waist and abdomen, and the depression in the waist and buttocks is W-shaped. The intestinal spine in the pelvis in the crotch area is the joint connecting the femur. With the pelvis as the fulcrum, the waist can twist and swing, and the crotch can be lifted, put down, swung and twisted. The structure of the crotch does not exist independently, it is connected with the lumbar spine upwards and the joints downwards.
Extended data:
Word: crotch
Pinyin: [kua bù]
Description: The part between waist and thigh.
Hips and thighs, too. -"Shuo Wen". Paragraph note: "say hip in two words."
Get out of my crotch. -Biography of Historical Records and Huaiyin
[Li Kui jy] wanted to split the door at the edge of the city and was hugged by Yanqing. -"Water Margin"
References:
Baidu encyclopedia-crotch