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Which one of the following is not a part of a renal pyramid?
A
Loops of Henle
B
Peritubular capillaries
C
Convoluted tubules
D
Collecting ducts
Detailed Solution
The kidney has an outer cortex and an inner medulla; the medulla is divided into conical masses called renal (medullary) pyramids.
The Malpighian corpuscle, the proximal convoluted tubule and the distal convoluted tubule of each nephron lie in the cortex.
The loops of Henle dip into the medulla, and the collecting ducts run through the medullary pyramids to open at the papillae.
The capillaries running along the loops (peritubular capillaries and vasa recta) also extend into the medulla.
Hence the convoluted tubules are not a part of a renal pyramid.
The Malpighian corpuscle, the proximal convoluted tubule and the distal convoluted tubule of each nephron lie in the cortex.
The loops of Henle dip into the medulla, and the collecting ducts run through the medullary pyramids to open at the papillae.
The capillaries running along the loops (peritubular capillaries and vasa recta) also extend into the medulla.
Hence the convoluted tubules are not a part of a renal pyramid.