The renal bed is part of the renal tunic and is also called the renal fat capsule. The peritoneum of the kidney can be divided into three layers from the inside to the outside, which are the fibrous capsule, the fat capsule and the renal fascia in that order. The second layer of the fat capsule, also called renal bed, is a layer of adipose tissue that surrounds the adrenal glands and one side of the renal tissues, and has the function of protecting and supporting the kidneys; its thickness can be up to 2 centimeters in adults, and its adipose tissue is relatively more developed in the edges and the back of the kidneys. Clinically, perinephritis is an infection of this layer of the renal peritoneum; when the renal capsule is closed, drugs are injected into this layer of the renal peritoneum. If you have kidney problems, it is recommended to consult a doctor in a regular hospital.