Nephron Diagram: Parts, Filtrate Flow, and Three Transport Processes

Follow One Fluid Route Before Adding Exchange Arrows

A nephron diagram needs a continuous tubular pathway and a clear distinction between blood and filtrate. The capillary tuft of the glomerulus carries blood. The surrounding capsular space receives filtrate, which passes through tubular segments where its composition changes.

Start with the nephron diagram generator for a focused teaching draft. The kidney diagram provides the organ-level context: cortex, medulla, calyces and renal pelvis. The two views complement each other, but they do not use the same scale.

Labeled Nephron Diagram: A Simplified Route

Original AI-generated illustration; labels and pathway markers by AcaDraw. The route is simplified and not to scale. Surrounding capillary beds, vasa recta, transporter proteins and precise cortical/medullary boundaries are omitted. The collecting duct is shown for downstream context.

The diagram deliberately separates the two limbs of the loop so their order is easy to trace. Real tubules occupy three-dimensional tissue, and the distal segment returns near its own corpuscle at the juxtaglomerular apparatus. That proximity is not reproduced here; this reference is a pathway model rather than a reconstruction of one nephron's exact position.

The Filtrate Pathway, in Order

The renal corpuscle includes the glomerulus and its surrounding capsule, often called Bowman's capsule. The glomerulus is not a synonym for the entire corpuscle, and its red capillaries do not continue as an open blood-filled proximal tubule.

Collecting ducts receive fluid from multiple nephrons. They are commonly drawn beside a nephron to complete the route, but are generally distinguished from the nephron proper. This distinction matters when an assignment asks specifically for “parts of the nephron.”

Filtration, Reabsorption, and Secretion Mean Different Directions

Blood cells and most plasma proteins normally stay in the circulation during filtration. Reabsorption then returns much of the filtered water and many useful solutes. Secretion adds selected substances to the tubular fluid. A classroom nephron diagram should identify these directions before attaching specific ions, drugs or transporters.

What Changes Along the Tubules?

The proximal segment carries out substantial reabsorption of water and solutes, as well as secretion of selected substances. In normal physiology it reabsorbs nearly all filtered glucose under usual loads, but this should not become an unconditional claim for every concentration or disease state.

The thin descending limb is relatively permeable to water. Ascending portions reabsorb salts while being relatively impermeable to water; thin and thick segments use different mechanisms. Together with the surrounding tissue and blood supply, the loop contributes to the medullary osmotic gradient. A U-shaped line alone does not explain that mechanism.

Distal and collecting segments participate in regulated electrolyte and water handling. Hormones, including aldosterone and antidiuretic hormone, affect specific transport processes. To teach those mechanisms, use a separate segment-level inset rather than attaching one universal “water out” arrow to the whole loop.

Cortical and Juxtamedullary Nephrons

Not every nephron has the same loop extent. Cortical nephrons tend to have shorter loops, while juxtamedullary nephrons have longer loops extending more deeply into the medulla. Their associated vascular arrangements also matter for concentrating urine.

This simplified nephron diagram does not claim to show both types or locate a cortex–medulla boundary. An assignment about those differences needs two explicitly labeled examples with consistent orientation. For the gross tissue regions, return to the kidney cortex and medulla guide.

Check the Route Before Sharing

Trace the lumen with a finger: capsule, proximal coil, descending limb, hairpin, ascending limb, distal coil and collecting system. Check for accidental shortcuts where two nearby lines touch, blind branches, reversed arrowheads or a capillary connected directly to the urinary tubule.

Then check the key. A route arrow means fluid moves along the lumen; an exchange arrow crosses a wall. Those are different statements. Keep transport values out of a qualitative figure unless they come from a defined physiological model.

Create your draft with the nephron diagram generator, then review the labels and connections. Generation requires an account and credits; neither an illustrated output nor editable shapes guarantee anatomical accuracy.

References and Scope

1. OpenStax Anatomy and Physiology: Microscopic Anatomy of the Kidney — renal corpuscles, tubular segments and nephron types.
2. OpenStax Anatomy and Physiology: Tubular Reabsorption — segment-specific transport and water handling.
3. OpenStax Anatomy and Physiology: Physiology of Urine Formation — filtration and urine-formation context.

Prepared by the AcaDraw product team; source and label check on October 29, 2026. Sources support the explanation; their illustrations were not reused. Independent medical review has not been completed. Educational content only, not for diagnosis or treatment.