A double-walled, cup-shaped structure around the glomerulus of each nephron of the vertebrate kidney. It serves as a filter to remove organic wastes, excess inorganic salts, and water.

• 肾小球囊，鲍曼氏囊：脊椎动物肾的肾小球周围的双层壁杯状结构，有过滤作用，能除去有机废物、过量的无机盐和水