Microscopically, it can be seen that each kidney is mainly composed of about 6.5438+0 million nephrons with the same structure and function and a small amount of connective tissue, with a large number of blood vessels and nerve fibers in between. Nephron consists of renal corpuscles and renal tubules. The renal tubules rejoin the collecting duct.
Extended data:
The position of the kidney: the right renal hilum is facing the transverse process of the second lumbar vertebra, and the left renal hilum is facing the transverse process of the first lumbar vertebra. The right kidney is slightly lower than the left kidney 1-2 cm because of the liver relationship. Normal kidney moves up and down in the range of 1-2 cm. The kidney is under the diaphragm. During physical examination, the left kidney is not easy to touch except the lower pole of the right kidney can be touched at the lower edge of the rib.
The kidneys are located on both sides of the spine, near the posterior abdominal wall and behind the peritoneum. The upper end of the left kidney is flat on the lower edge of 1 1 thoracic vertebra, and the lower end is flat on the lower edge of 2 lumbar vertebrae. The right kidney is half a vertebral body lower than the left kidney. The left 12 rib obliquely passes through the posterior middle part of the left kidney and the right 12 rib obliquely passes through the posterior upper part of the right kidney.