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Fibrous Capsule of Kidney (Posterior; Left)
Urogenital System

Fibrous Capsule of Kidney (Posterior; Left)

Capsula fibrosa renis

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A thin fibrous capsule composed of collagen rich tissue with some elastic and smooth muscle fibers encloses each kidney. Each fibrous capsule is surrounded by renal fascia and a layer of perirenal fat, known as the adipose capsule of the kidney.

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The tough fibrous capsule of the kidney helps to protect the kidney from injury and supports the kidney mass. Additionally, it plays a role in restricting volume changes of the kidney in response to increases in blood pressure (Pocock, Richards and Richards, 2013).


Pocock, G., Richards, C. D. & Richards, D. A. (2013) Human Physiology, 4 edition. OUP Oxford.

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Kidney Capsule

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If the kidney capsule is allowed to dry out, the cortex may tear when trying to insert the catheter under the capsule.

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