` tags, based on 身体器官后背位置图片大全百科 (Body Organ Back Location Picture Encyclopedia):

Kidneys

The kidneys are located bilaterally in the retroperitoneal space, meaning they sit behind the peritoneal cavity. They are positioned on either side of the vertebral column, extending from the level of the T12 to L3 vertebrae. The right kidney is often slightly lower than the left due to the presence of the liver.

Key Locations:

• Flank region (sides of the back)
• Posterior to the abdominal organs

Lungs (Posterior Portion)

While the lungs primarily reside in the thoracic cavity, a significant portion extends posteriorly. The lower lobes of the lungs extend further down the back than the upper lobes, and can be auscultated (listion Diagram”>

The liver is primarily located in the right upper quadrant of the abdomen. However, its posterior aspect, particularly the posteriorsuperior portion, can influence the location of referred pain or physical findings in the back.

Key Locations:

• Right upper quadrant of the abdomen, with posterior influence.

Other Organs and Structures

Other structures that have a relationship to the back include the following, although not shown as images:

• 
  Pancreas:
  
  Lies horizontally across the abdomen, and its tail can extend toward the left posterior side.
• 
  Stomach:
  
  The stomach is mostly in the abdomen, but its posterior portion has relations with the back.
• 
  Major Blood Vessels and Nerves:
  
  Such as the aorta, inferior vena cava, and various spinal nerves, run near or adjacent to the back.