Histology Guide virtual histology laboratory

Chapter 16 - Urinary System

The urinary system (also known as the renal system) consists of the kidneys, ureters, urinary bladder, and the urethra. Its main function is the production, storage, and expulsion of urine.

Kidney

The kidney is involved in the formation of urine and regulation of pressure, volume, and pH of blood.

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MH 143 Kidney

(H&E)

(monkey)

Nephrons are the functional units of the kidney. Each nephron includes a filter, called the renal corpuscle, and a single, long tubule through which the filtrate passes before emerging as urine.

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MH 141a Kidney

(H&E)

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MH 141b Kidney

(H&E)

Each nephron is supported by a thin layer of connective tissue.

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MH 142 Kidney

(azan)

Urine is unchanged after it leaves the kidney.

Fetal Kidney

During the development of the kidney, additional renal corpuscles form in the outer cortex as the kidney grows. Those found deeper in the inner cortex are more mature.

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MH 140 Kidney Fetal

(H&E)

Ureter

The ureters are fibromuscular tubes that carry urine from the kidney to the bladder. Like the bladder, it is lined by transitional epithelium (urothelium).

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MH 146 Ureter

(H&E)

(longitudinal and cross-sections)

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MHS 215 Ureter

(H&E)

(longitudinal and cross-sections)

Urinary Bladder

The urinary bladder is a muscular sac that stores urine, allowing urination to be infrequent and voluntary. It is lined by transitional epithelium (urothelium).

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MH 147 Bladder

(H&E)

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MH 018 Transitional Epithelia

(H&E)

(relaxed and stretched bladder)

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MHS 214 Bladder

(H&E)