Page 4 - LN- EXCRETION

Inside the kidney, the ureter is expanded as a funnel-shaped cavity called pelvis. The free
end of pelvis has number of cup-like cavities called calyces (sing, calyx) major and minor.
Medulla projects into the calyces as conical processes, called renal pyramids or medullary
pyramids. The tip of pyramids are called renal papillae. The cortex spreads in between
medullary pyramids as renal columns called columns of Bertini.
Microscopic Structure
Each kidney is composed of numerous (nearly one million) complex tubular structure called
nephrons, which are the functional units of kidney.
Structure of Nephron Uriniferous Tubule
Each nephron consists of two parts, i.e., the Malpighian body or renal corpuscle and the
renal tubule.
i. Malpighian Body or Renal Corpuscle
Glomerulus along with Bowman’s capsule is called the Malpighian body or renal corpuscle
which filters out large solutes from the blood and delivers small solutes to the renal tubule
for modification.