Cortical nephrons either have short or do not have loops of Henle. Only juxtamedullary nephrons have long loops of Henle, which plunge into the renal medulla and create a hypersomotic interstitium via counter current multiphication.

What is the juxtamedullary nephron?

In other words, a juxtamedullary nephron is a nephron whose renal corpuscle is near the medulla, and whose proximal convoluted tubule and its associated loop of Henle occur deeper in the medulla than the other type of nephron, the cortical nephron.

What are the 2 types of nephrons?

There are two types of nephron, those with long Henle’s loops and those with short loops. Short loops turn back in the outer medulla or even in the cortex (cortical loops). Long loops turn back at successive levels of the inner medulla.

What are the structural difference between Juxtamedullary and cortical nephrons and between their capillary beds?

The major difference between cortical nephrons and juxtamedullary nephrons are the length of the loops of Henle. In cortical nephrons, the glomeruli, proximal and distal convoluting ducts, and loops of Henle stay limited to the cortex. In juxtamedullary nephrons, they extend into the medulla.

What are the differences in structure and function of the cortical nephrons and Juxtamedullary nephrons?

The main difference between cortical nephron and juxtamedullary nephron is that cortical nephron contains a short loop of Henle which only extends into the outer region of the renal medulla whereas juxtamedullary nephron contains a longer loop of Henle which extends deeper into the inner medulla.

Where are Juxtaglomerular cells?

kidney
Juxtaglomerular cells (JG cells), also known as granular cells are cells in the kidney that synthesize, store, and secrete the enzyme renin. They are specialized smooth muscle cells mainly in the walls of the afferent arterioles (and some in the efferent arterioles) that deliver blood to the glomerulus.

What is the function of cortical nephrons?

Cortical nephrons (85% of all nephrons) mainly perform excretory and regulatory functions, while juxtamedullary nephrons (15% of nephrons) concentrate and dilute urine.

What is cortical nephrons?

Cortical nephron is a microscopic structural and functional unit of the kidney with a short loop of Henle, which penetrates only the outer renal medulla. The Malpighian corpuscles of these nephrons are located in the outer part of the renal cortex. Cortical nephrons occur in all vertebrates.

Do cortical nephrons have Juxtaglomerular apparatus?

Cortical nephrons have short loops of Henle, whereas juxtamedullary nephrons have long loops of Henle extending into the medulla. About 15 percent of nephrons are juxtamedullary. The glomerulus is a capillary bed that filters blood principally based on particle size.

What is the difference between the peritubular capillaries and the Vasa recta?

Vasa recta are the tiny capillaries that surround Henle loops and provide nutrients and oxygen to renal medulla while peritubular capillaries are the capillaries that surround the proximal and distal tubules and provide nutrients and oxygen to the renal cortex.

Why are Juxtamedullary nephrons important?

Although both cortical and juxtamedullary nephrons regulate the concentrations of solutes and water in the blood, countercurrent multiplication in the loops of Henle of juxtamedullary nephrons is largely responsible for developing the osmotic gradients that are needed to concentrate urine.

What is Juxtaglomerular?

The juxtaglomerular apparatus (also known as the juxtaglomerular complex) is a structure in the kidney that regulates the function of each nephron, the functional units of the kidney. The juxtaglomerular apparatus is named because it is next to (juxta-) the glomerulus.

What is the difference between a juxtamedullary and cortical nephron?

Juxtamedullary nephron is a microscopic structural and functional unit of the kidney with a long loop of Henle. Cortical nephrons have a short loop of Henle, which penetrates only the outer renal medulla. Juxtamedullary nephrons have a long loop of Henle extending deep into the renal medulla.

What is reabsorbed in the cortical nephrons?

The reabsorption occurs in the renal tubules of the cortical nephrons. Most of the water, glucose, amino acids, and ions are reabsorbed in the renal tubules. The reabsorption of important molecules occurs through the vasa recta, which is a vascular network around the loop of Henle.

What are the two types of nephrons in the kidney?

Two types of nephrons can be identified in kidneys. They are cortical nephrons and juxtamedullary nephrons. The cortical nephron does not go deep into the medulla, and their glomerulus is in the cortex. The juxtamedullary nephron is going deeper into the medulla, and their glomerulus lies in the border of cortex and medulla.

Why is the vasa recta small in the cortical nephrons?

The reabsorption of important molecules occurs through the vasa recta, which is a vascular network around the loop of Henle. Since the loop of Henle is short, the vasa recta is also small in the cortical nephrons. The final filtrate of a nephron is called the urine.