Question

“Columns of Bertini” in the kidney of mammals are formed as the extension of
A. Medulla into Cortex
B. Cortex into Medulla
C. Medulla into Pelvis
D. Pelvis into the ureter

Answer 1

Hint: Column of Bertini are cortical tissue portions in between medullary pyramids. It helps in the anchorage of the cortex. Each column consists of lines of blood vessels and urinary tubes and fibrous material.

Complete step by step answer: The kidney in mammals is a paired organ in the shape of a bean. The prime function of the organ is to filter and purify the blood flowing through it. The filtrate which comes out after the process of purification is known as urine and is an excretory product. The kidneys also function in maintaining the osmolarity of the body fluids, by maintaining the adequate osmotic pressure with all the dissolved electrolytes and various salts. Nephrons are the functional basic units of kidneys. Each of the organs is composed of a million nephrons. The organs also function as a gland and produce hormones such as erythropoietin, which stimulates the process of synthesis of RBCs, and also renin. Columns of Bertini are also known as renal columns. Its main function is to make the cortex anchored in a better manner to the medullary region. It is made up of fibrous material and also has blood vessels and urinary tubes passing through them.

Note: The renal columns are the extensions of the medulla into the cortex and it continues its extensions in between the renal pyramids. It can also be explained as an extension of the renal tissue for the separation of the renal pyramids.