EXCRETORY PASSAGES

Function: conveying of urine.

Anantomic features:

The urine flows sequentially

• Minor calyx
• Major calyx
• Renal pelvis
• Ureter
• Urinary bladder
• Urethra

MUCOSA

Composition:

• Stratified transitional epithelium
• Lamina propria, dense collagenous connective tissue

SUBMUCOSA

Composition: loose connective tissue

MUSCULARIS

Function: distention and contraction

Composition: smooth muscle is arranged in three layers: an inner longitudinal, a middle circular, and the outer longitudinal

ADVENTITIA OR SEROSA

Composition:

• thick layer of dense connective tissue with large blood vessels, extensive lymphatic network, and autonomic nerves, elastic fibers and adipose tissue
• upper surface of the bladder - thin layer of loose connective tissue covered by mesothelium