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25.1 Internal and External Anatomy of the Kidney

Learning Objectives

By the end of this section, you will be able to:

  • Describe the external structure of the kidney, including its location, support structures, and covering
  • Identify the major internal divisions and structures of the kidney
  • Identify the major blood vessels associated with the kidney and trace the path of blood through the kidney
  • Identify the major structures and subdivisions of the nephron and describe them histologically

External Anatomy

The paired kidneys lie on either side of the spine in the retroperitoneal space between the parietal peritoneum and the posterior abdominal wall, well protected by muscle, fat, and ribs. The left kidney is located at about the T12 to L3 vertebrae, whereas the right is lower due to slight displacement by the liver. Upper portions of the kidneys are somewhat protected by the eleventh and twelfth ribs (Figure 25.1.1). Each kidney weighs about 125–175 g in males and 115–155 g in females. They are about 11–14 cm in length, 6 cm wide, and 4 cm thick, and are directly covered by a fibrous capsule composed of dense, irregular connective tissue that helps to hold their shape and protect them. This capsule is covered by a shock-absorbing layer of adipose tissue called the renal fat pad, which in turn is encompassed by a tough renal fascia. The fascia and, to a lesser extent, the overlying peritoneum serve to firmly anchor the kidneys to the posterior abdominal wall in a retroperitoneal position.

This image shows a human torso and shows the location of the kidneys within the torso.
Figure 25.1.1 – Kidneys: The kidneys are slightly protected by the ribs and are surrounded by fat for protection. On the superior aspect of each kidney is an adrenal gland.
Each kidney looks like the kidney bean and the renal hilum is the entry and exit site for structures servicing the kidneys: vessels, nerves, lymphatics, and ureters. The medial-facing hila are tucked into the convex indentation of the kidney.
The left panel of this figure shows the location of the kidneys in the abdomen. The right panel shows the cross section of the kidney.
Figure 25.1.2 – Left Kidney

Internal Anatomy

A frontal section through the kidney reveals an outer region called the renal cortex and an inner region called the renal medulla (Figure 25.1.2). In the medulla, 5-8 renal pyramids are separated by connective tissue renal columnsEach pyramid creates urine and terminates into a renal papilla. Each renal papilla drains into a collecting pool called a minor calyx; several minor calyces connect to form a major calyx; all major calyces connect to the single renal pelvis which connects to the ureter.

Blood Supply of the Kidney & Nephrons

The kidneys are well vascularized and receive about 25 percent of the cardiac output at rest. Blood enters the kidney via the paired renal arteries that form directly from the descending aorta and each enters the kidney at the renal hila. Once in the kidney, each renal artery first divides into segmental arteries, followed by further branching to form interlobar arteries that pass through the renal columns to reach the cortex (Figure 25.1.3). The interlobar arteries, in turn, branch into arcuate arteries, cortical radiate arteries, and then into afferent arterioles. The afferent arterioles deliver blood into a modified capillary bed called the glomerulus which is a component of the “functional unit” of the kidney called the nephron. There are about 1.3 million nephrons in each kidney and they function to filter the blood. Once the nephrons have filtered the blood, renal veins return blood directly to the inferior vena cava. A portal system is formed when the blood flows from the glomerulus to the efferent arteriole through a second capillary bed, the peritubular capillaries (and vasa recta), surrounding the proximal and distal convoluted tubules and the loop of Henle. Most water and solutes are recovered by this second capillary bed. This filtrate is processed and finally gathered by collecting ducts that drain into the minor calyces, which merge to form major calyces; the filtrate then proceeds to the renal pelvis and finally the ureters.

This figure shows the network of blood vessels and the blood flow in the kidneys.
Figure 25.1.3 – Blood Flow in the Kidney

Chapter Review

As noted previously, the structure of the kidney is divided into two principle regions—the peripheral rim of cortex and the central medulla. The two kidneys receive about 25 percent of cardiac output. They are protected in the retroperitoneal space by the renal fat pad and overlying ribs and muscle. Ureters, blood vessels, lymph vessels, and nerves enter and leave at the renal hilum. The renal arteries arise directly from the aorta, and the renal veins drain directly into the inferior vena cava. Kidney function is derived from the actions of about 1.3 million nephrons per kidney; these are the “functional units.” A capillary bed, the glomerulus, filters the blood and the filtrate is captured by the Bowman’s capsule. A portal system is formed when the blood flows through a second capillary bed surrounding the proximal and distal convoluted tubules and the loop of Henle. Most water and solutes are recovered by this second capillary bed. This filtrate is processed and finally gathered by collecting ducts that drain into the minor calyces, which merge to form the major calyces; the filtrate then proceeds to the renal pelvis and finally the ureters.

Review Questions

For further instruction on using H5P activities, please visit Appendix D.

Critical Thinking Questions

What anatomical structures provide protection to the kidney?

Reveal
Retroperitoneal anchoring, renal fat pads, and ribs provide protection to the kidney.

How does the renal portal system differ from the hypothalamo–hypophyseal and digestive portal systems?

Reveal
The renal portal system has an artery between the first and second capillary bed. The others have a vein.

Name the structures found in the renal hilum.

Reveal
The structures found in the renal hilum are arteries, veins, ureters, lymphatics, and nerves.
Glossary
calyces
cup-like structures receiving urine from the collecting ducts where it passes on to the renal pelvis and ureter
renal columns
extensions of the renal cortex into the renal medulla; separates the renal pyramids; contains blood vessels and connective tissues
renal cortex
outer part of kidney containing all of the nephrons; some nephrons have loops of Henle extending into the medulla
renal fat pad
adipose tissue between the renal fascia and the renal capsule that provides protective cushioning to the kidney
renal hilum
recessed medial area of the kidney through which the renal artery, renal vein, ureters, lymphatics, and nerves pass
renal medulla
inner region of kidney containing the renal pyramids
renal papillae
medullary area of the renal pyramids where collecting ducts empty urine into the minor calyces
renal pyramids
six to eight cone-shaped tissues in the medulla of the kidney containing collecting ducts and the loops of Henle of juxtamedullary nephrons
definition

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Anatomy & Physiology 2e Copyright © 2025 by Lindsay M. Biga, Staci Bronson, Sierra Dawson, Amy Harwell, Robin Hopkins, Joel Kaufmann, Mike LeMaster, Philip Matern, Katie Morrison-Graham, Kristen Oja, Devon Quick, Jon Runyeon, and OpenStax is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License, except where otherwise noted.