The outer one-third of the kidney is called the A. Medulla B. Minor calyces C. Renal pyramid D. Cortex...

Human body consists of a pair of bean-shaped organs, known as Kidney. It is situated posterior to the abdominal cavity on the side of the vertebrae. The longitudinal section of kidney is sub-divided into three parts. The primary function of kidney is the elimination of waste, hence, they are considered as the principal organ of urinary system.

Explanation of incorrect answer :

• Medulla is a light colored middle portion of the kidney. Therefore, it cannot be the outer third part of the kidney.
• In the interior of the kidney, ureter expands and forms a funnel-shaped body, that is known as renal pelvis. It is divided into major calyces, which is further sub-divided into minor calyces. Hence, it is also not the outermost portion of kidney.
• Papillary ducts in the kidney extends to the cortex, to form a triangular-shaped structure, commonly known as a Renal Pyramid. Hence, it can also not be the outermost structure of kidney.

Answer :

(D) Cortex

Explanation :

The outermost layer of kidney is a thick fibrous structure known as Capsule. Below the capsule, lies a layer known as Cortex. Cortex is a dark-brownish, outer one-third part of kidney.